Question

a well whose diameter is 14cm and 25m deep .find the volume of mud taken out of the well . also find the cost of plastering the well from inside at the rate of Rs.3 per square metre...

Answer 1

volume=πr²h
=(22/7 x 7 x 7 x 2500)cm³
=385000cm³
cost of plastering=2πrh×3
=2 x 22/7 x 7/100 x 25 x 3
=33Rupees


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