The diameter of a circular garden is 7 m. Find its area.
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Radius of the garden =35m
Radius of the garden with road =35+7=42m
Area of the region between two concentric circles with radius of outer circle R, and inner circle r =π(R2−r2)
Hence, the area of the road =π(422−352)=722×(42+35)×(42−35)=722×77×7=1694m2
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