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Question 8

Find the cost of polishing a circular table-top of diameter 1.6 m, if the rate of polishing is 15/m2
 (Take π=3.14)


Solution

Diameter of the circular table top = 1.6 m

 Radius of the circular table top
=1.62 = 0.8 m

Area of circular table top = πr2
=3.14×0.8×0.8 = 2.0096 m2

Now cost of polishing 1 m2 =   ₹ 15
Then cost of polishing 2.0096 m2 = 15 × 2.0096 =  ₹ 30.14 (approx)

Thus, the cost of polishing a circular table top is  30.14 (approx)

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