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प्रश्न
The floor of the circular swimming pool whose radius is 7 m has to be cemented at the rate of ₹ 18 per m2. Find the total cost of cementing the floor
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उत्तर
Radius of the circular swimming pool r = 7 m
Area of the circular swimming pool A = πr2 sq.units
= `22/7 xx 7 xx 7 "m"^2`
= 154 m2
Cost of cementing a m2 floor = ₹ 18
Cost of cementing 154 m2 floor = ₹ 18 × 154
= ₹ 2,772
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