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Question

If you have two lawns - one in front of your house and the other at the back of 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


  1. i. 30 cm, ii. 40 cm

  2. i. 36 cm, ii. 60 cm

  3. i. 40 cm, ii. 56 cm

  4. i. 34 cm, ii. 64 cm 


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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