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Question -

A circular park is surrounded by a rod 21 m wide. If the radius of the park is 105 m, find the area of the road. [NCERT Exemplar]



Answer -

Given that, a circular park is surrounded by a road.
Width of the road = 21 m
Radius of the park (r1)= 105 m

.’. Radius of whole circular portion (park + road),
re = 105 + 21 = 126m
Now, area of road = Area of whole circular portion – Area of circular park
= πr2 – πr2            [∵ area of circle = πr2]

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