Example 1 · level 1
A rectangular greeting card is 9 cm long and 5 cm wide. What is its perimeter?
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- 2 × (9 + 5) = 2 × 14 = 28 cm.
Answer: 28 cm
CLASS 3 MATHS · MEASUREMENT
Perimeter of rectangles and squares
Perimeter is the distance all around: add every side. Rectangle: 2 × (length + breadth). Square: 4 × side.
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Worked examples
Example 2 · level 2
A square photo frame is 12 cm on each side. What is its perimeter?
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- 4 × 12 = 48 cm.
Answer: 48 cm
Example 3 · level 3
A square garden is 11 m on each side. What is its perimeter? (This is the length of fence needed.)
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- 4 × 11 = 44 m.
Answer: 44 m