Math, asked by dhanashreekawale48, 1 month ago

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 XxitsmrseenuxX
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 engving
1

Step-by-step explanation:

6864 is the cost....

♡(*´ω`*)/♡

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