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Question

If you have two lawns - one in front of your house and the other at the back, in the shape of a rectangle, find the perimeter if its lengths and breadth s are given as follows: i. l = 10 cm, b = 8 cm ii. l = 18 cm, b = 12 cm

A

i. 30 cm, ii. 40 cm

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B

i. 36 cm, ii. 60 cm

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C

i. 40 cm, ii. 56 cm

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D

i. 34 cm, ii. 64 cm

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Solution

The correct option is B i. 36 cm, ii. 60 cm The general algebraic formula for perimeter of rectangle = 2(l + b) i. l = 10 cm, b = 8 cm Perimeter = 2(l + b) = 2(10 + 8) = 2 × 18 = 36 cm. ii. l = 18 cm, b = 12 cm ​ Perimeter = 2(l + b) = 2(18 +12) = 2 × 30 = 60 cm.

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