Question

find the cost of polishing a circular table top of diameter 1.6 M if the rate of polishing is ₹ 15/m2
$(take \: \pi = 3.14)$



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Answer 1

diameter=2×radius

radius=0.8 m

area of table top =π×r^2
3.14×.8×.8=2.0


rate =15×2=rs 30

Answer 2

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 r2

= 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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