Question

a well is dug whose diameter is 4m and the depth is 10m. Find the quantity of earth taken out.Calculate the cost of plastering the curved (inner) surface at ₹5.00 each

Answer 1

see first take out the radius 4/2=2 so2m is the radius

depth =height=10m
volume of the cylinder take it out

take out the volume of the earth taken out by using the vol because we know that volume of cylinder =earth taken out.

multiply the cost and CSA of the inner portion we will get the cost

Answer 2

First we should find the raidius and volume.
R=2m
Volume=3.14x2x2x10
=3.14x40
=125.6m
Cost of plastering=125.6x5
=₹628
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