Example 1 · level 1
The perimeter of a rectangular park is 94 m and its length is 29 m. Find its breadth.
Show solution
- l + b = 47.
- b = 47 − 29 = 18 m.
Answer: 18 m
CLASS 5 MATHS · MENSURATION
Area and perimeter (including missing sides)
Rectangle: area = l × b, perimeter = 2(l + b). Square: area = side × side, perimeter = 4 × side.
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Worked examples
Example 2 · level 2
The perimeter of a rectangular park is 54 m and its length is 20 m. Find its breadth.
Show solution
- l + b = 27.
- b = 27 − 20 = 7 m.
Answer: 7 m
Example 3 · level 3
A square tile has a perimeter of 28 cm. What is its area in cm²?
Show solution
- Side = 7 cm.
- Area = 7 × 7 = 49 cm².
Answer: 49