A circular park of radius 12 cm has a road of 4 cm width all around it's outside. Find the area of the road
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r = 12 cm
R = r+4 = 12+4 = 16 cm
area of road = area of big circle - area of small circle
= πR^2-πr^2
= π{ 16^2-12^2)
= 22/7 ( 256-144)
= 22/7× 112
= 22×16
= 352 cm ^2 ans
hope it'll help you......
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