the inner diameter of a well is 4.20 metre & it's depth is 10 metre find the inner surface area of the well find the cost of plastering it from inside at the rate Rs.52persq.m
Answers
Answered by
27
Step-by-step explanation:
Given:
Inner diameter (d) = 4.2 m,
To find:
depth (h) = 10 m,
rate of plastering = Rs 52 per sq.m.
Inner surface area and total cost of plastering
i. Inner curved surface area of the well
= 2πrh
= πdh [∵ d = 2r]
= 7–√22722 x 4.2 x 10
= 7–√22722 x 42
= 22 x 6
= 132 sq.m.
ii. Rate of plastering = Rs 52 per sq.m.
∴ Total cost = Curved surface area x Rate of plastering
= 132 x 52 = Rs 6864
∴ The cost of plastering the well from inside is Rs 6864.
Answered by
1
Step-by-step explanation:
6864 is the cost....
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