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Question -

Find the cost of polishing a circular table-top of diameter 1.6 m, if the rate of polishing is тВ╣ 15 m2. (Take ╧А = 3.14)



Answer -

Given:
Diameter = 1.6 m
тИ┤ Radius=┬а1.6┬а=0.8 m
Area of the table-top = ╧Аr2
= 3.14 ├Ч 0.8 ├Ч 0.8 m2
= 2.0096 m2
тИ┤ Costof polishing = тВ╣ 15 ├Ч 2.0096
= тВ╣ 30.14 (approx.)

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