Shark Learning
Second/Geometry

Perimeter of L-Shapes

Calculate the perimeter of L-shaped polygons.
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Study Guide

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Practice Questions

  1. Perimeter = ? cm
    Show answer

    28

  2. Perimeter = ? m
    Show answer

    36

  3. Perimeter = ? in
    Show answer

    22

  4. Perimeter = ? ft
    Show answer

    44

  5. Perimeter = ? cm
    Show answer

    32

Quick Tip
Add the lengths of all outer sides. Don't forget the missing sides!
Teacher Resources
Teaching Notes

This collection focuses on perimeter of l-shapes. Use grid paper to help students visualize area and perimeter.

Vocabulary
Missing side: An edge length not given.
Parallel sides: Sides that are the same distance apart.
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)
  • Missing a side length
  • Confusing perimeter with area
  • Incorrect sum of lengths
  • Not identifying all 6 sides
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 L-shapes differ from rectangles?
  • What strategies can help find all side lengths?
  • Could an L-shape have different side lengths but the same perimeter?
  • How is perimeter useful in real life?
Extension Activities
  • Measure the classroom floor area.
  • Design a garden with a specific perimeter.
  • Create art using only rectangles of specific areas.
Parent Tip

Use string to measure the perimeter of an L-shaped object.

Learning Path
Skill Cluster

Geometry & Measurement

Estimated Time

20 minutes

Skills Practiced
Perimeter of l-shapes