A road of radius 21 around a road of width 7 cm find the area of the road
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R=21cm;r=21-7=14cm
area=π[R^2-r^2]
=22/7×35×7
=22×35=770cm^2
area=π[R^2-r^2]
=22/7×35×7
=22×35=770cm^2
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