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Question

There are two lawns in the shape of a rectangle. Find the perimeter of the lawns if its lengths and breadths are given as follows:
i. l = 10 cm, b = 8 cm
ii. l = 18 cm, b = 12 cm
where l = length and b = breadth


  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) 
For (i)
l = 10 cm, b = 8 cm
Perimeter = 2(l + b)
                 = 2(10 + 8)
                 = 2 × 18
                 = 36 cm.
For (ii)
l =18 cm, b = 12 cm ​
Perimeter = 2(l + b)
                 = 2(18 +12)
                 = 2 × 30
                 = 60 cm.

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