A circular pond is 21 m in diameter. It is surrounded by 3.5 m wide path. Find the cost of constructing the path at the rate of Rs. 25 per m2.
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Area of path = 22/7 *R*R -22/7 *r*r
Now, = 22/7(14*14-10.5*10.5)
=22/7 ( 196-110.25)
= 22/7*86.25
= 269.5 m square
Cost of constructing = 269.5 *25 Rs
= Rs 6737.5 Ans
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