Question

how many cubic meters of the earth must be dug to sink a well of diameter 7 m?​

Answer 1

Answer:

Step-by-step explanation:

volume of earth to be dug-out = volume of the well

           

7

22

​  

×  

2

7

​  

×  

2

7

​  

×22.5m  

3

 = 866.25m  

3

 

area of the inner curved  surface  

=2πrh

=2×  

7

22

​  

×  

2

7

​  

×22.5m  

2

 

=495

The cost of plastering the inner curved surface

=495×3=Rs1485

Answer 2

Answer:

UR ANS..........

Step-by-step explanation:

#sivi copied ans.... lol