Grade 3/Geometry
Area of L-Shapes (1107)
Calculate the area of L-shaped polygons.
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Quick Tip
Split the L-shape into two rectangles, find the area of each, and add them together.
Teacher Resources
Teaching Notes
This collection focuses on area of l-shapes. Use grid paper to help students visualize area and perimeter.
Vocabulary
L-shape: A shape like the letter L.
Decompose: Break into smaller parts.
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)
- Incorrect decomposition
- Misidentifying side lengths
- Multiplication errors
- Forgetting to add areas
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 many ways can you split an L-shape into rectangles?
- Does the way you split an L-shape affect its total area?
- Why is decomposing helpful for finding area?
- When might you encounter L-shapes 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 blocks to build an L-shape and find its area.
Learning Path
Skill Cluster
Geometry & Measurement
Estimated Time
20 minutes
Skills Practiced
area of l-shapes
Prerequisites
- 1106
- Area of Rectangles
- Multiplication Facts
Next Steps
- Area of Composite Shapes (More Complex)
- Area of Irregular Polygons
- Perimeter of L-Shapes
- Area of Rectangles