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Grade 4/Geometry

Perimeter of Composite Figures

Calculate the perimeter of L-shaped composite figures.
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Easy
1
8 questions
2
8 questions
Medium
1
8 questions
2
8 questions
Hard
1
8 questions
2
8 questions
Prerequisites
Area of Composite Figures6 WS
Find Area
What to Do Next
Area on a Grid8 WS
What is the name of this shape?
5 units 2 units

Practice Questions

  1. Find the perimeter.
    Show answer

    28 cm

  2. Find the perimeter.
    Show answer

    36 cm

  3. Find the perimeter.
    Show answer

    24 cm

  4. Find the perimeter.
    Show answer

    32 cm

  5. Find the perimeter.
    Show answer

    24 cm

Quick Tip
Add all the outer side lengths together. Hint: For L-shapes, Perimeter = 2 × (Total Width + Total Height).
Teacher Resources
Teaching Notes

This collection focuses on perimeter of composite figures. Use grid paper to help students visualize area and perimeter.

Vocabulary
Perimeter: Distance around a 2D shape.
Composite Figure: A shape made of smaller shapes.
Common Mistakes
  • Confusing Area and Perimeter formulas
  • Forgetting to double the sides for Perimeter
  • Using wrong units (e.g., cm instead of sq cm for Area)
  • Forgetting hidden side lengths.
  • Adding interior partition lines.
  • Confusing perimeter with area.
  • Arithmetic calculation errors.
Differentiation
SupportHave students trace shapes on grid paper and count squares.
ChallengeChallenge students to find multiple rectangles with the same area but different perimeters.
Discussion Questions
  • What is the difference between Area and Perimeter?
  • Can two rectangles have the same perimeter but different areas?
  • Why do we use 'square' units for area?
  • How do we find all the outer edge lengths?
  • What strategies help find unknown side lengths?
  • Why is knowing perimeter useful in real life?
  • How does an L-shape relate to a rectangle?
Extension Activities
  • Measure the classroom floor area.
  • Design a garden with a specific perimeter.
  • Create art using only rectangles of specific areas.
Parent Tip

Walk the perimeter of your home and count steps for each side.

Learning Path
Skill Cluster

Geometry and Measurement

Estimated Time

20 minutes

Skills Practiced
Perimeter of composite figures