Shape Transformation Sequence

Shape Transformation Sequence problems involve sequences where shapes transform by gaining or losing sides (e.g., triangle → square → pentagon → hexagon). These problems test recognition of geometric progression in regular polygons.

10Worksheets
200+Practice Questions
HardDifficulty
2-3 hoursHours to Master

Introduction to Shape Transformation Sequence

Shape Transformation Sequence problems involve sequences where shapes transform by gaining or losing sides (e.g., triangle → square → pentagon → hexagon). These problems test recognition of geometric progression in regular polygons.

Prerequisites

Regular polygon identification Side counting Geometric vocabulary (triangle, quadrilateral, pentagon, etc.) Arithmetic progression
Why This Matters: Shape transformation problems appear in moderate to advanced exams. You can expect 1-2 questions in SSC CGL, 1-2 in Banking PO, and 1-2 in Railways RRB exams.

How to Solve Shape Transformation Sequence Problems

1

Step 1: Count the number of sides in each figure

2

Step 2: Calculate the difference between consecutive side counts

3

Step 3: Check if the difference is constant (e.g., +1 side each time)

4

Step 4: Identify the shape name for each side count

5

Step 5: Apply the pattern to find the next shape

6

Step 6: Verify that the shapes are regular (equal sides and angles)

7

Step 7: Draw or identify the shape with the predicted side count

Pro Strategy: Always count sides systematically. Remember shape names: 3=Triangle, 4=Quadrilateral/Square, 5=Pentagon, 6=Hexagon, 7=Heptagon, 8=Octagon, 9=Nonagon, 10=Decagon.

Example Problem

Example: Sequence: Triangle, Square, Pentagon, Hexagon. What comes next? Solution: Step 1: Sides: 3, 4, 5, 6 Step 2: Differences: +1, +1, +1 Step 3: Next side count = 6 + 1 = 7 Step 4: 7-sided polygon = Heptagon Answer: Heptagon

Pro Tips & Tricks

  • Triangle (3 sides) → Square (4) → Pentagon (5) → Hexagon (6)
  • Watch for decreasing side counts (reverse pattern)
  • Some patterns may skip shapes (e.g., triangle → pentagon → heptagon, +2 each step)
  • Irregular shapes may transform into regular ones
  • The shape may also rotate or change size while changing side count
  • Remember: Circle can be considered as polygon with infinite sides

Shortcut Methods to Solve Faster

+1 pattern: 3,4,5,6 → next = 7 (Heptagon)
+2 pattern: 3,5,7,9 → next = 11 (Hendecagon)
×2 pattern: 3,6,12,24 → next = 48
Shape names: 3=Tri, 4=Tetra/Quad, 5=Penta, 6=Hexa, 7=Hepta, 8=Octa

Common Mistakes to Avoid

Miscounting sides, especially on complex shapes
Confusing shape names (hexagon vs heptagon)
Assuming shapes are regular when they may be irregular
Not considering that shape may also rotate or scale

Exam Importance

Shape Transformation Sequence is an important topic for various competitive exams. Here's how frequently it appears:

SSC CGL
1-2 questions
BANKING PO
1-2 questions
RAILWAYS RRB
1-2 questions
CAT
1-2 questions
UPSC
1-2 questions

Ready to Master Shape Transformation Sequence?

Start with Worksheet 1 and work your way up to expert level! Each worksheet includes:

20 practice questions
Detailed solutions
Step-by-step explanations
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