The adjoining figure represents a rectangular lawn with a circular flower bed in the middle. Find: (i) the area of the whole land. (ii) the area of the flower bed. (iii) the area of the lawn excluding the area of the flower bed. (iv) the circumference of the flower bed.

Length of rectangular lawn = 10 m,
breadth of the rectangular lawn = 5m
And radius of the circular flower bed = 2m
(i) Area of the whole land = length x breadth
= 10 x 5 = 50 m²
(ii) Area of flower bed = πr²
= 3.14 x 2 x 2 = 12.56 m²
(iii) Area of lawn excluding the area of the flower bed
= area of lawn – area of flower bed
= 50 – 12.56
= 37.44 m²
(iv) The circumference of the flower bed = 2πr
= 2 x 3.14 x 2 = 12.56 m

Class 7 Maths Chapter 11 Exercise 11.4

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