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A circular pond of of 21m in diameter. it is surrounded by 3.5m wide path. find the surface area of constructing the path at the rate of Rs.25 per metre.



D=21cm inner radius(r) =21/2cm=10.5cm
Outer radius(R) = 10.5+ 3.5=14cm
Inner area= pie r^2=22/7*10.5*10.5=346.5cm^2
Outer area = pie R^2 = 22/7*14*14=616 cm^2
Area of path= 616-346.5=269. 5cm^2
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