Question

a well of diameter 7 m and height 20 m is dug out. find the cost of plastering the curved surface of the well at the rate of 20 per m²​

Answer 1

Answer:

Rs.8800

Step-by-step explanation:

CSA of Cylinder = 2πrh

Given,

diameter=7

radius=7/2

CSA of Cylinder=2πrh

=

$2 \times \frac{22}{7} \times \frac{7}{2} \times 20$

CSA of Cylinder=440m^2

rate = 20 per meter

So,

Total cost=440 x 20

Rs.8800

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