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Question

Find the cost of polishing a circular table top of diameter 1.6, if the rate of polishing is ₹15/m^2

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Solution

To calculate the cost of polishing of circular table, we have to calculate its area first of all

.Here, Given diameter of the circular table-top = 1.6 m.

Hence, r = 0.8 m


Area = π r^2
= 3.14 × 0.8 × 0.8 = 2.0096 sq m


Cost of polishing = Rate × Area

= Rs 15 × 2.0096 = Rs 30.144


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