Starter quiz
What is the length of the side marked in the diagram?- '2 cm' ✓
What is the length of the side marked in the diagram?- '4 cm' ✓
- Mariam wants to fence in a pentagonal garden. Each side of the pentagon measures 6 meters. What is the perimeter of Mariam's garden?
- 6 m
- 24 m
- 30 m ✓
- 36 m
-
- Mia wants to enclose her garden in the shape of an irregular hexagon. The lengths of the sides of the hexagon are 5 m, 7 m, 4 m, 6 m, 9 m, and 8 m. What is the perimeter of Emma's garden?
- '39 m' ✓
- Alex wants to frame a triangular picture. The lengths of two sides of the triangle are 80 cm and 120 cm. If the perimeter of the triangle is 350 meters, what is the length of the third side?
- '150 cm' ✓
- Jun wants to build a rectangular pond in his backyard. The pond has a length of 2.6 m and a perimeter of 8.6 meters. What is the width of the pond?
- '1.7 m' ✓
Exit quiz
- True or false? A composite shape is an alternative term for a compound shape.
- True ✓
- False
Calculate the perimeter of the shape.- 24 cm
- 30 cm ✓
- 39 cm
- 48 cm
-
- A ______ shape is a shape created using two or more basic shapes.
- 'compound' ✓
- A composite rectilinear shape is made from ______
- triangles
- quadrilaterals
- rectangles ✓
- polygons
-
Calculate the perimeter.- '21.2 m' ✓
Calculate the perimeter.- '118 units' ✓
Worksheet
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Presentation
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Lesson Details
Key learning points
- You can identify how to find the perimeter of compound shapes made of rectangles.
- You can calculate the perimeter of compound shapes made from rectangles.
- You can generalise the perimeter of compound shapes made of rectangles.
- It is possible to find missing lengths in compound shapes made from rectangles.
Common misconception
Pupils may think they can always double the length and width to calculate the perimeter.
This only works for composite rectilinear shapes if the lengths do not overlap.
Keywords
Compound shape - A compound shape is a shape created using two or more basic shapes.
Composite shape - A composite shape is an alternative term for a compound shape.
Composite rectilinear shape - A composite rectilinear shape is a composite shape made from rectangles.
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