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Rectangles and boundaries
Rectangles and boundaries
Example 1
A rectangle is 8cm long and 4cm wide. Find its perimeter, in cm.
RectangleDiagram not to scaleShow worked answer
Answer: 24
- The boundary has two sides of each length.
- 8+4+8+4=24cm.
Example 2
A square has side length 4cm. Find its perimeter, in cm.
SquareDiagram not to scaleShow worked answer
Answer: 16
- A square has four equal sides.
- 4×4=16cm.
Example 3
A rectangle is 7cm long and 6cm wide. Find its area, in cm2.
RectangleDiagram not to scaleShow worked answer
Answer: 42
- There are 6 rows of 7 square centimetres.
- 7×6=42cm2.
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