Question

a well is dug whose diameter is 4m and the depth is 10 M . find the quantity of earth taken out. calculate the cost of pasting the curved (inner) surface at rupees 5.00 per square metre

Answer 1

hey friend here is your answer

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the radius of the well is 2m
and depth 10m

so the quantity of Earth taken is =π×
${2}^{2}$
×10=40π metre cube

the total curved area of the well is
=2π×2×10=40π metre square

so,the cost of panting total
curved surface is =40×π×5=628.31 rupees

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