a well is dug out from earth whose diameter is 4m and depth 10m find the quantity - Maths - Mensuration

Question

a well is dug out from earth whose diameter is 4m and depth 10m
find the quantity of earth taken out calculate the cost of
plastering curved inner surface of the well at the rate of rs 5 per
meter

Neha Sethi · Accepted Answer

Dear student
d=4m,de=10mGiven inside radius(r) of well=42m=2mand its depth(h)=10m1) So,The quantity of earth excavated=Volume of the well=πr2h=π×22×10=40πm3=40×227m3=8807m32) Inner curved surface area=2πrh=2×227×2×10=8807m23)Cost of plastering 1m2 area=Rs5Cost of plastering 8807m2 area=Rs8807×5=Rs628
57
Regards

a well is dug out from earth whose diameter is 4m and depth 10m . find the quantity of earth taken out . calculate the cost of plastering curved inner surface of the well at the rate of rs.5 per meter.