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Angle Property Oddity Beginner-Intermediate Worksheet: Focus on common variations practice Angle Property Oddity BEGINNER INTERMEDIATE

Level up your Angle Property Oddity skills! You're at Worksheet 4 of 10 (33% through this series). This step-up challenge worksheet features 20 beginner-intermediate-level problems with a focus on common variations practice. Topics covered: angle property oddity for competitive exams, how to solve angle property oddity, angle property oddity tricks.

📝 Worksheet 4 of 10 • 20 questions • ⏱️ Estimated time: 20 minutes • 🎯 Beginner Intermediate level

What you'll learn in this worksheet:
Your progress through Angle Property Oddity
Worksheet 4 of 10 (33% complete)

Question 1

Find the odd figure out based on angle properties. Figure A: Figure B: Figure C: Figure D: Figure E:
Step-by-step Solution:

Step 1: Analyze angles in all figures
- Examine each interior angle of every polygon
- Classify angles as acute (<90°), right (=90°), or obtuse (>90°)

Step 2: Identify the common angle property
- Four figures contain ONLY acute angles (<90°) or right angles (=90°)
- Squares have all 90° angles (right angles)
- Equilateral triangles have all 60° angles (acute)
- These figures never exceed 90° in any interior angle

Step 3: Detect the figure with obtuse angle
- Figure C contains at least one OBTUSE angle (>90°)
- This triangle has one angle greater than 90 degrees
- This breaks the "no angles greater than 90°" property

Step 4: Mathematical verification
- Acute angle: 0° < angle < 90°
- Right angle: angle = 90°
- Obtuse angle: 90° < angle < 180°
- Figure C is the only one with an obtuse angle

Advanced Geometric Analysis:
- This tests understanding of angle classification
- Requires visual estimation or calculation of angles
- Triangle types: Acute-angled, Right-angled, Obtuse-angled
- Figure C is an obtuse-angled triangle

Angle Identification Strategy:
1. Focus on each corner/vertex
2. Mentally compare each angle to 90° (right angle)
3. Classify each angle
4. Look for the figure with an angle type that differs from others

Common Mistakes:
- Not carefully examining all angles in each figure
- Confusing angle size with side length
- Missing subtle obtuse angles in triangles
- Not knowing angle classifications (acute, right, obtuse)
- Estimating angles incorrectly

Question 2

Find the odd figure out based on angle properties. Figure A: Figure B: Figure C: Figure D: Figure E:
Step-by-step Solution:

Step 1: Analyze angles in all figures
- Examine each interior angle of every polygon
- Classify angles as acute (<90°), right (=90°), or obtuse (>90°)

Step 2: Identify the common angle property
- Four figures contain ONLY acute angles (<90°) or right angles (=90°)
- Squares have all 90° angles (right angles)
- Equilateral triangles have all 60° angles (acute)
- These figures never exceed 90° in any interior angle

Step 3: Detect the figure with obtuse angle
- Figure E contains at least one OBTUSE angle (>90°)
- This triangle has one angle greater than 90 degrees
- This breaks the "no angles greater than 90°" property

Step 4: Mathematical verification
- Acute angle: 0° < angle < 90°
- Right angle: angle = 90°
- Obtuse angle: 90° < angle < 180°
- Figure E is the only one with an obtuse angle

Advanced Geometric Analysis:
- This tests understanding of angle classification
- Requires visual estimation or calculation of angles
- Triangle types: Acute-angled, Right-angled, Obtuse-angled
- Figure E is an obtuse-angled triangle

Angle Identification Strategy:
1. Focus on each corner/vertex
2. Mentally compare each angle to 90° (right angle)
3. Classify each angle
4. Look for the figure with an angle type that differs from others

Common Mistakes:
- Not carefully examining all angles in each figure
- Confusing angle size with side length
- Missing subtle obtuse angles in triangles
- Not knowing angle classifications (acute, right, obtuse)
- Estimating angles incorrectly

Question 3

Find the odd figure out based on angle properties. Figure A: Figure B: Figure C: Figure D: Figure E:
Step-by-step Solution:

Step 1: Analyze angles in all figures
- Examine each interior angle of every polygon
- Classify angles as acute (<90°), right (=90°), or obtuse (>90°)

Step 2: Identify the common angle property
- Four figures contain ONLY acute angles (<90°) or right angles (=90°)
- Squares have all 90° angles (right angles)
- Equilateral triangles have all 60° angles (acute)
- These figures never exceed 90° in any interior angle

Step 3: Detect the figure with obtuse angle
- Figure D contains at least one OBTUSE angle (>90°)
- This triangle has one angle greater than 90 degrees
- This breaks the "no angles greater than 90°" property

Step 4: Mathematical verification
- Acute angle: 0° < angle < 90°
- Right angle: angle = 90°
- Obtuse angle: 90° < angle < 180°
- Figure D is the only one with an obtuse angle

Advanced Geometric Analysis:
- This tests understanding of angle classification
- Requires visual estimation or calculation of angles
- Triangle types: Acute-angled, Right-angled, Obtuse-angled
- Figure D is an obtuse-angled triangle

Angle Identification Strategy:
1. Focus on each corner/vertex
2. Mentally compare each angle to 90° (right angle)
3. Classify each angle
4. Look for the figure with an angle type that differs from others

Common Mistakes:
- Not carefully examining all angles in each figure
- Confusing angle size with side length
- Missing subtle obtuse angles in triangles
- Not knowing angle classifications (acute, right, obtuse)
- Estimating angles incorrectly

Question 4

Find the odd figure out based on angle properties. Figure A: Figure B: Figure C: Figure D: Figure E:
Step-by-step Solution:

Step 1: Analyze angles in all figures
- Examine each interior angle of every polygon
- Classify angles as acute (<90°), right (=90°), or obtuse (>90°)

Step 2: Identify the common angle property
- Four figures contain ONLY acute angles (<90°) or right angles (=90°)
- Squares have all 90° angles (right angles)
- Equilateral triangles have all 60° angles (acute)
- These figures never exceed 90° in any interior angle

Step 3: Detect the figure with obtuse angle
- Figure B contains at least one OBTUSE angle (>90°)
- This triangle has one angle greater than 90 degrees
- This breaks the "no angles greater than 90°" property

Step 4: Mathematical verification
- Acute angle: 0° < angle < 90°
- Right angle: angle = 90°
- Obtuse angle: 90° < angle < 180°
- Figure B is the only one with an obtuse angle

Advanced Geometric Analysis:
- This tests understanding of angle classification
- Requires visual estimation or calculation of angles
- Triangle types: Acute-angled, Right-angled, Obtuse-angled
- Figure B is an obtuse-angled triangle

Angle Identification Strategy:
1. Focus on each corner/vertex
2. Mentally compare each angle to 90° (right angle)
3. Classify each angle
4. Look for the figure with an angle type that differs from others

Common Mistakes:
- Not carefully examining all angles in each figure
- Confusing angle size with side length
- Missing subtle obtuse angles in triangles
- Not knowing angle classifications (acute, right, obtuse)
- Estimating angles incorrectly

Question 5

Find the odd figure out based on angle properties. Figure A: Figure B: Figure C: Figure D: Figure E:
Step-by-step Solution:

Step 1: Analyze angles in all figures
- Examine each interior angle of every polygon
- Classify angles as acute (<90°), right (=90°), or obtuse (>90°)

Step 2: Identify the common angle property
- Four figures contain ONLY acute angles (<90°) or right angles (=90°)
- Squares have all 90° angles (right angles)
- Equilateral triangles have all 60° angles (acute)
- These figures never exceed 90° in any interior angle

Step 3: Detect the figure with obtuse angle
- Figure B contains at least one OBTUSE angle (>90°)
- This triangle has one angle greater than 90 degrees
- This breaks the "no angles greater than 90°" property

Step 4: Mathematical verification
- Acute angle: 0° < angle < 90°
- Right angle: angle = 90°
- Obtuse angle: 90° < angle < 180°
- Figure B is the only one with an obtuse angle

Advanced Geometric Analysis:
- This tests understanding of angle classification
- Requires visual estimation or calculation of angles
- Triangle types: Acute-angled, Right-angled, Obtuse-angled
- Figure B is an obtuse-angled triangle

Angle Identification Strategy:
1. Focus on each corner/vertex
2. Mentally compare each angle to 90° (right angle)
3. Classify each angle
4. Look for the figure with an angle type that differs from others

Common Mistakes:
- Not carefully examining all angles in each figure
- Confusing angle size with side length
- Missing subtle obtuse angles in triangles
- Not knowing angle classifications (acute, right, obtuse)
- Estimating angles incorrectly

Question 6

Find the odd figure out based on angle properties. Figure A: Figure B: Figure C: Figure D: Figure E:
Step-by-step Solution:

Step 1: Analyze angles in all figures
- Examine each interior angle of every polygon
- Classify angles as acute (<90°), right (=90°), or obtuse (>90°)

Step 2: Identify the common angle property
- Four figures contain ONLY acute angles (<90°) or right angles (=90°)
- Squares have all 90° angles (right angles)
- Equilateral triangles have all 60° angles (acute)
- These figures never exceed 90° in any interior angle

Step 3: Detect the figure with obtuse angle
- Figure C contains at least one OBTUSE angle (>90°)
- This triangle has one angle greater than 90 degrees
- This breaks the "no angles greater than 90°" property

Step 4: Mathematical verification
- Acute angle: 0° < angle < 90°
- Right angle: angle = 90°
- Obtuse angle: 90° < angle < 180°
- Figure C is the only one with an obtuse angle

Advanced Geometric Analysis:
- This tests understanding of angle classification
- Requires visual estimation or calculation of angles
- Triangle types: Acute-angled, Right-angled, Obtuse-angled
- Figure C is an obtuse-angled triangle

Angle Identification Strategy:
1. Focus on each corner/vertex
2. Mentally compare each angle to 90° (right angle)
3. Classify each angle
4. Look for the figure with an angle type that differs from others

Common Mistakes:
- Not carefully examining all angles in each figure
- Confusing angle size with side length
- Missing subtle obtuse angles in triangles
- Not knowing angle classifications (acute, right, obtuse)
- Estimating angles incorrectly

Question 7

Find the odd figure out based on angle properties. Figure A: Figure B: Figure C: Figure D: Figure E:
Step-by-step Solution:

Step 1: Analyze angles in all figures
- Examine each interior angle of every polygon
- Classify angles as acute (<90°), right (=90°), or obtuse (>90°)

Step 2: Identify the common angle property
- Four figures contain ONLY acute angles (<90°) or right angles (=90°)
- Squares have all 90° angles (right angles)
- Equilateral triangles have all 60° angles (acute)
- These figures never exceed 90° in any interior angle

Step 3: Detect the figure with obtuse angle
- Figure B contains at least one OBTUSE angle (>90°)
- This triangle has one angle greater than 90 degrees
- This breaks the "no angles greater than 90°" property

Step 4: Mathematical verification
- Acute angle: 0° < angle < 90°
- Right angle: angle = 90°
- Obtuse angle: 90° < angle < 180°
- Figure B is the only one with an obtuse angle

Advanced Geometric Analysis:
- This tests understanding of angle classification
- Requires visual estimation or calculation of angles
- Triangle types: Acute-angled, Right-angled, Obtuse-angled
- Figure B is an obtuse-angled triangle

Angle Identification Strategy:
1. Focus on each corner/vertex
2. Mentally compare each angle to 90° (right angle)
3. Classify each angle
4. Look for the figure with an angle type that differs from others

Common Mistakes:
- Not carefully examining all angles in each figure
- Confusing angle size with side length
- Missing subtle obtuse angles in triangles
- Not knowing angle classifications (acute, right, obtuse)
- Estimating angles incorrectly

Question 8

Find the odd figure out based on angle properties. Figure A: Figure B: Figure C: Figure D: Figure E:
Step-by-step Solution:

Step 1: Analyze angles in all figures
- Examine each interior angle of every polygon
- Classify angles as acute (<90°), right (=90°), or obtuse (>90°)

Step 2: Identify the common angle property
- Four figures contain ONLY acute angles (<90°) or right angles (=90°)
- Squares have all 90° angles (right angles)
- Equilateral triangles have all 60° angles (acute)
- These figures never exceed 90° in any interior angle

Step 3: Detect the figure with obtuse angle
- Figure C contains at least one OBTUSE angle (>90°)
- This triangle has one angle greater than 90 degrees
- This breaks the "no angles greater than 90°" property

Step 4: Mathematical verification
- Acute angle: 0° < angle < 90°
- Right angle: angle = 90°
- Obtuse angle: 90° < angle < 180°
- Figure C is the only one with an obtuse angle

Advanced Geometric Analysis:
- This tests understanding of angle classification
- Requires visual estimation or calculation of angles
- Triangle types: Acute-angled, Right-angled, Obtuse-angled
- Figure C is an obtuse-angled triangle

Angle Identification Strategy:
1. Focus on each corner/vertex
2. Mentally compare each angle to 90° (right angle)
3. Classify each angle
4. Look for the figure with an angle type that differs from others

Common Mistakes:
- Not carefully examining all angles in each figure
- Confusing angle size with side length
- Missing subtle obtuse angles in triangles
- Not knowing angle classifications (acute, right, obtuse)
- Estimating angles incorrectly

Question 9

Find the odd figure out based on angle properties. Figure A: Figure B: Figure C: Figure D: Figure E:
Step-by-step Solution:

Step 1: Analyze angles in all figures
- Examine each interior angle of every polygon
- Classify angles as acute (<90°), right (=90°), or obtuse (>90°)

Step 2: Identify the common angle property
- Four figures contain ONLY acute angles (<90°) or right angles (=90°)
- Squares have all 90° angles (right angles)
- Equilateral triangles have all 60° angles (acute)
- These figures never exceed 90° in any interior angle

Step 3: Detect the figure with obtuse angle
- Figure D contains at least one OBTUSE angle (>90°)
- This triangle has one angle greater than 90 degrees
- This breaks the "no angles greater than 90°" property

Step 4: Mathematical verification
- Acute angle: 0° < angle < 90°
- Right angle: angle = 90°
- Obtuse angle: 90° < angle < 180°
- Figure D is the only one with an obtuse angle

Advanced Geometric Analysis:
- This tests understanding of angle classification
- Requires visual estimation or calculation of angles
- Triangle types: Acute-angled, Right-angled, Obtuse-angled
- Figure D is an obtuse-angled triangle

Angle Identification Strategy:
1. Focus on each corner/vertex
2. Mentally compare each angle to 90° (right angle)
3. Classify each angle
4. Look for the figure with an angle type that differs from others

Common Mistakes:
- Not carefully examining all angles in each figure
- Confusing angle size with side length
- Missing subtle obtuse angles in triangles
- Not knowing angle classifications (acute, right, obtuse)
- Estimating angles incorrectly

Question 10

Find the odd figure out based on angle properties. Figure A: Figure B: Figure C: Figure D: Figure E:
Step-by-step Solution:

Step 1: Analyze angles in all figures
- Examine each interior angle of every polygon
- Classify angles as acute (<90°), right (=90°), or obtuse (>90°)

Step 2: Identify the common angle property
- Four figures contain ONLY acute angles (<90°) or right angles (=90°)
- Squares have all 90° angles (right angles)
- Equilateral triangles have all 60° angles (acute)
- These figures never exceed 90° in any interior angle

Step 3: Detect the figure with obtuse angle
- Figure B contains at least one OBTUSE angle (>90°)
- This triangle has one angle greater than 90 degrees
- This breaks the "no angles greater than 90°" property

Step 4: Mathematical verification
- Acute angle: 0° < angle < 90°
- Right angle: angle = 90°
- Obtuse angle: 90° < angle < 180°
- Figure B is the only one with an obtuse angle

Advanced Geometric Analysis:
- This tests understanding of angle classification
- Requires visual estimation or calculation of angles
- Triangle types: Acute-angled, Right-angled, Obtuse-angled
- Figure B is an obtuse-angled triangle

Angle Identification Strategy:
1. Focus on each corner/vertex
2. Mentally compare each angle to 90° (right angle)
3. Classify each angle
4. Look for the figure with an angle type that differs from others

Common Mistakes:
- Not carefully examining all angles in each figure
- Confusing angle size with side length
- Missing subtle obtuse angles in triangles
- Not knowing angle classifications (acute, right, obtuse)
- Estimating angles incorrectly

Question 11

Find the odd figure out based on angle properties. Figure A: Figure B: Figure C: Figure D: Figure E:
Step-by-step Solution:

Step 1: Analyze angles in all figures
- Examine each interior angle of every polygon
- Classify angles as acute (<90°), right (=90°), or obtuse (>90°)

Step 2: Identify the common angle property
- Four figures contain ONLY acute angles (<90°) or right angles (=90°)
- Squares have all 90° angles (right angles)
- Equilateral triangles have all 60° angles (acute)
- These figures never exceed 90° in any interior angle

Step 3: Detect the figure with obtuse angle
- Figure D contains at least one OBTUSE angle (>90°)
- This triangle has one angle greater than 90 degrees
- This breaks the "no angles greater than 90°" property

Step 4: Mathematical verification
- Acute angle: 0° < angle < 90°
- Right angle: angle = 90°
- Obtuse angle: 90° < angle < 180°
- Figure D is the only one with an obtuse angle

Advanced Geometric Analysis:
- This tests understanding of angle classification
- Requires visual estimation or calculation of angles
- Triangle types: Acute-angled, Right-angled, Obtuse-angled
- Figure D is an obtuse-angled triangle

Angle Identification Strategy:
1. Focus on each corner/vertex
2. Mentally compare each angle to 90° (right angle)
3. Classify each angle
4. Look for the figure with an angle type that differs from others

Common Mistakes:
- Not carefully examining all angles in each figure
- Confusing angle size with side length
- Missing subtle obtuse angles in triangles
- Not knowing angle classifications (acute, right, obtuse)
- Estimating angles incorrectly

Question 12

Find the odd figure out based on angle properties. Figure A: Figure B: Figure C: Figure D: Figure E:
Step-by-step Solution:

Step 1: Analyze angles in all figures
- Examine each interior angle of every polygon
- Classify angles as acute (<90°), right (=90°), or obtuse (>90°)

Step 2: Identify the common angle property
- Four figures contain ONLY acute angles (<90°) or right angles (=90°)
- Squares have all 90° angles (right angles)
- Equilateral triangles have all 60° angles (acute)
- These figures never exceed 90° in any interior angle

Step 3: Detect the figure with obtuse angle
- Figure E contains at least one OBTUSE angle (>90°)
- This triangle has one angle greater than 90 degrees
- This breaks the "no angles greater than 90°" property

Step 4: Mathematical verification
- Acute angle: 0° < angle < 90°
- Right angle: angle = 90°
- Obtuse angle: 90° < angle < 180°
- Figure E is the only one with an obtuse angle

Advanced Geometric Analysis:
- This tests understanding of angle classification
- Requires visual estimation or calculation of angles
- Triangle types: Acute-angled, Right-angled, Obtuse-angled
- Figure E is an obtuse-angled triangle

Angle Identification Strategy:
1. Focus on each corner/vertex
2. Mentally compare each angle to 90° (right angle)
3. Classify each angle
4. Look for the figure with an angle type that differs from others

Common Mistakes:
- Not carefully examining all angles in each figure
- Confusing angle size with side length
- Missing subtle obtuse angles in triangles
- Not knowing angle classifications (acute, right, obtuse)
- Estimating angles incorrectly

Question 13

Find the odd figure out based on angle properties. Figure A: Figure B: Figure C: Figure D: Figure E:
Step-by-step Solution:

Step 1: Analyze angles in all figures
- Examine each interior angle of every polygon
- Classify angles as acute (<90°), right (=90°), or obtuse (>90°)

Step 2: Identify the common angle property
- Four figures contain ONLY acute angles (<90°) or right angles (=90°)
- Squares have all 90° angles (right angles)
- Equilateral triangles have all 60° angles (acute)
- These figures never exceed 90° in any interior angle

Step 3: Detect the figure with obtuse angle
- Figure E contains at least one OBTUSE angle (>90°)
- This triangle has one angle greater than 90 degrees
- This breaks the "no angles greater than 90°" property

Step 4: Mathematical verification
- Acute angle: 0° < angle < 90°
- Right angle: angle = 90°
- Obtuse angle: 90° < angle < 180°
- Figure E is the only one with an obtuse angle

Advanced Geometric Analysis:
- This tests understanding of angle classification
- Requires visual estimation or calculation of angles
- Triangle types: Acute-angled, Right-angled, Obtuse-angled
- Figure E is an obtuse-angled triangle

Angle Identification Strategy:
1. Focus on each corner/vertex
2. Mentally compare each angle to 90° (right angle)
3. Classify each angle
4. Look for the figure with an angle type that differs from others

Common Mistakes:
- Not carefully examining all angles in each figure
- Confusing angle size with side length
- Missing subtle obtuse angles in triangles
- Not knowing angle classifications (acute, right, obtuse)
- Estimating angles incorrectly

Question 14

Find the odd figure out based on angle properties. Figure A: Figure B: Figure C: Figure D: Figure E:
Step-by-step Solution:

Step 1: Analyze angles in all figures
- Examine each interior angle of every polygon
- Classify angles as acute (<90°), right (=90°), or obtuse (>90°)

Step 2: Identify the common angle property
- Four figures contain ONLY acute angles (<90°) or right angles (=90°)
- Squares have all 90° angles (right angles)
- Equilateral triangles have all 60° angles (acute)
- These figures never exceed 90° in any interior angle

Step 3: Detect the figure with obtuse angle
- Figure B contains at least one OBTUSE angle (>90°)
- This triangle has one angle greater than 90 degrees
- This breaks the "no angles greater than 90°" property

Step 4: Mathematical verification
- Acute angle: 0° < angle < 90°
- Right angle: angle = 90°
- Obtuse angle: 90° < angle < 180°
- Figure B is the only one with an obtuse angle

Advanced Geometric Analysis:
- This tests understanding of angle classification
- Requires visual estimation or calculation of angles
- Triangle types: Acute-angled, Right-angled, Obtuse-angled
- Figure B is an obtuse-angled triangle

Angle Identification Strategy:
1. Focus on each corner/vertex
2. Mentally compare each angle to 90° (right angle)
3. Classify each angle
4. Look for the figure with an angle type that differs from others

Common Mistakes:
- Not carefully examining all angles in each figure
- Confusing angle size with side length
- Missing subtle obtuse angles in triangles
- Not knowing angle classifications (acute, right, obtuse)
- Estimating angles incorrectly

Question 15

Find the odd figure out based on angle properties. Figure A: Figure B: Figure C: Figure D: Figure E:
Step-by-step Solution:

Step 1: Analyze angles in all figures
- Examine each interior angle of every polygon
- Classify angles as acute (<90°), right (=90°), or obtuse (>90°)

Step 2: Identify the common angle property
- Four figures contain ONLY acute angles (<90°) or right angles (=90°)
- Squares have all 90° angles (right angles)
- Equilateral triangles have all 60° angles (acute)
- These figures never exceed 90° in any interior angle

Step 3: Detect the figure with obtuse angle
- Figure E contains at least one OBTUSE angle (>90°)
- This triangle has one angle greater than 90 degrees
- This breaks the "no angles greater than 90°" property

Step 4: Mathematical verification
- Acute angle: 0° < angle < 90°
- Right angle: angle = 90°
- Obtuse angle: 90° < angle < 180°
- Figure E is the only one with an obtuse angle

Advanced Geometric Analysis:
- This tests understanding of angle classification
- Requires visual estimation or calculation of angles
- Triangle types: Acute-angled, Right-angled, Obtuse-angled
- Figure E is an obtuse-angled triangle

Angle Identification Strategy:
1. Focus on each corner/vertex
2. Mentally compare each angle to 90° (right angle)
3. Classify each angle
4. Look for the figure with an angle type that differs from others

Common Mistakes:
- Not carefully examining all angles in each figure
- Confusing angle size with side length
- Missing subtle obtuse angles in triangles
- Not knowing angle classifications (acute, right, obtuse)
- Estimating angles incorrectly

Question 16

Find the odd figure out based on angle properties. Figure A: Figure B: Figure C: Figure D: Figure E:
Step-by-step Solution:

Step 1: Analyze angles in all figures
- Examine each interior angle of every polygon
- Classify angles as acute (<90°), right (=90°), or obtuse (>90°)

Step 2: Identify the common angle property
- Four figures contain ONLY acute angles (<90°) or right angles (=90°)
- Squares have all 90° angles (right angles)
- Equilateral triangles have all 60° angles (acute)
- These figures never exceed 90° in any interior angle

Step 3: Detect the figure with obtuse angle
- Figure A contains at least one OBTUSE angle (>90°)
- This triangle has one angle greater than 90 degrees
- This breaks the "no angles greater than 90°" property

Step 4: Mathematical verification
- Acute angle: 0° < angle < 90°
- Right angle: angle = 90°
- Obtuse angle: 90° < angle < 180°
- Figure A is the only one with an obtuse angle

Advanced Geometric Analysis:
- This tests understanding of angle classification
- Requires visual estimation or calculation of angles
- Triangle types: Acute-angled, Right-angled, Obtuse-angled
- Figure A is an obtuse-angled triangle

Angle Identification Strategy:
1. Focus on each corner/vertex
2. Mentally compare each angle to 90° (right angle)
3. Classify each angle
4. Look for the figure with an angle type that differs from others

Common Mistakes:
- Not carefully examining all angles in each figure
- Confusing angle size with side length
- Missing subtle obtuse angles in triangles
- Not knowing angle classifications (acute, right, obtuse)
- Estimating angles incorrectly

Question 17

Find the odd figure out based on angle properties. Figure A: Figure B: Figure C: Figure D: Figure E:
Step-by-step Solution:

Step 1: Analyze angles in all figures
- Examine each interior angle of every polygon
- Classify angles as acute (<90°), right (=90°), or obtuse (>90°)

Step 2: Identify the common angle property
- Four figures contain ONLY acute angles (<90°) or right angles (=90°)
- Squares have all 90° angles (right angles)
- Equilateral triangles have all 60° angles (acute)
- These figures never exceed 90° in any interior angle

Step 3: Detect the figure with obtuse angle
- Figure B contains at least one OBTUSE angle (>90°)
- This triangle has one angle greater than 90 degrees
- This breaks the "no angles greater than 90°" property

Step 4: Mathematical verification
- Acute angle: 0° < angle < 90°
- Right angle: angle = 90°
- Obtuse angle: 90° < angle < 180°
- Figure B is the only one with an obtuse angle

Advanced Geometric Analysis:
- This tests understanding of angle classification
- Requires visual estimation or calculation of angles
- Triangle types: Acute-angled, Right-angled, Obtuse-angled
- Figure B is an obtuse-angled triangle

Angle Identification Strategy:
1. Focus on each corner/vertex
2. Mentally compare each angle to 90° (right angle)
3. Classify each angle
4. Look for the figure with an angle type that differs from others

Common Mistakes:
- Not carefully examining all angles in each figure
- Confusing angle size with side length
- Missing subtle obtuse angles in triangles
- Not knowing angle classifications (acute, right, obtuse)
- Estimating angles incorrectly

Question 18

Find the odd figure out based on angle properties. Figure A: Figure B: Figure C: Figure D: Figure E:
Step-by-step Solution:

Step 1: Analyze angles in all figures
- Examine each interior angle of every polygon
- Classify angles as acute (<90°), right (=90°), or obtuse (>90°)

Step 2: Identify the common angle property
- Four figures contain ONLY acute angles (<90°) or right angles (=90°)
- Squares have all 90° angles (right angles)
- Equilateral triangles have all 60° angles (acute)
- These figures never exceed 90° in any interior angle

Step 3: Detect the figure with obtuse angle
- Figure A contains at least one OBTUSE angle (>90°)
- This triangle has one angle greater than 90 degrees
- This breaks the "no angles greater than 90°" property

Step 4: Mathematical verification
- Acute angle: 0° < angle < 90°
- Right angle: angle = 90°
- Obtuse angle: 90° < angle < 180°
- Figure A is the only one with an obtuse angle

Advanced Geometric Analysis:
- This tests understanding of angle classification
- Requires visual estimation or calculation of angles
- Triangle types: Acute-angled, Right-angled, Obtuse-angled
- Figure A is an obtuse-angled triangle

Angle Identification Strategy:
1. Focus on each corner/vertex
2. Mentally compare each angle to 90° (right angle)
3. Classify each angle
4. Look for the figure with an angle type that differs from others

Common Mistakes:
- Not carefully examining all angles in each figure
- Confusing angle size with side length
- Missing subtle obtuse angles in triangles
- Not knowing angle classifications (acute, right, obtuse)
- Estimating angles incorrectly

Question 19

Find the odd figure out based on angle properties. Figure A: Figure B: Figure C: Figure D: Figure E:
Step-by-step Solution:

Step 1: Analyze angles in all figures
- Examine each interior angle of every polygon
- Classify angles as acute (<90°), right (=90°), or obtuse (>90°)

Step 2: Identify the common angle property
- Four figures contain ONLY acute angles (<90°) or right angles (=90°)
- Squares have all 90° angles (right angles)
- Equilateral triangles have all 60° angles (acute)
- These figures never exceed 90° in any interior angle

Step 3: Detect the figure with obtuse angle
- Figure D contains at least one OBTUSE angle (>90°)
- This triangle has one angle greater than 90 degrees
- This breaks the "no angles greater than 90°" property

Step 4: Mathematical verification
- Acute angle: 0° < angle < 90°
- Right angle: angle = 90°
- Obtuse angle: 90° < angle < 180°
- Figure D is the only one with an obtuse angle

Advanced Geometric Analysis:
- This tests understanding of angle classification
- Requires visual estimation or calculation of angles
- Triangle types: Acute-angled, Right-angled, Obtuse-angled
- Figure D is an obtuse-angled triangle

Angle Identification Strategy:
1. Focus on each corner/vertex
2. Mentally compare each angle to 90° (right angle)
3. Classify each angle
4. Look for the figure with an angle type that differs from others

Common Mistakes:
- Not carefully examining all angles in each figure
- Confusing angle size with side length
- Missing subtle obtuse angles in triangles
- Not knowing angle classifications (acute, right, obtuse)
- Estimating angles incorrectly

Question 20

Find the odd figure out based on angle properties. Figure A: Figure B: Figure C: Figure D: Figure E:
Step-by-step Solution:

Step 1: Analyze angles in all figures
- Examine each interior angle of every polygon
- Classify angles as acute (<90°), right (=90°), or obtuse (>90°)

Step 2: Identify the common angle property
- Four figures contain ONLY acute angles (<90°) or right angles (=90°)
- Squares have all 90° angles (right angles)
- Equilateral triangles have all 60° angles (acute)
- These figures never exceed 90° in any interior angle

Step 3: Detect the figure with obtuse angle
- Figure C contains at least one OBTUSE angle (>90°)
- This triangle has one angle greater than 90 degrees
- This breaks the "no angles greater than 90°" property

Step 4: Mathematical verification
- Acute angle: 0° < angle < 90°
- Right angle: angle = 90°
- Obtuse angle: 90° < angle < 180°
- Figure C is the only one with an obtuse angle

Advanced Geometric Analysis:
- This tests understanding of angle classification
- Requires visual estimation or calculation of angles
- Triangle types: Acute-angled, Right-angled, Obtuse-angled
- Figure C is an obtuse-angled triangle

Angle Identification Strategy:
1. Focus on each corner/vertex
2. Mentally compare each angle to 90° (right angle)
3. Classify each angle
4. Look for the figure with an angle type that differs from others

Common Mistakes:
- Not carefully examining all angles in each figure
- Confusing angle size with side length
- Missing subtle obtuse angles in triangles
- Not knowing angle classifications (acute, right, obtuse)
- Estimating angles incorrectly
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