Question

How much soil needs to be dug to make a well of height 7 M and diameter 2 M

Answer 1

Given:

A well of height 7 m and diameter 2 m

To find:

How much soil needs to be dug to make the well?

Solution:

The diameter of the well, d = 2 m

∴ The radius of the well, r = $\frac{d}{2} = \frac{2}{2} = 1\:m$

The height of the well, h = 7 m

Now,

The quantity of soil that needs to be dug out from the well is,

= The volume of the cylindrical well

= $\pi r^2 h$

on substituting the given values, we get

= $\frac{22}{7} \times (1) ^2 \times 7$

= $\frac{22}{7} \times 1 \times 7$

= $\bold{22\: cm^3}$

Thus, 22 cm³ of soil needs to be dug out to make the well of height 7 m and diameter 2 m.

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Answer 2

Volume = π r2h    

 R = 1m  h = 7m      

Volume =

 = 22m-3

even the verifiers cant check if the answers is correct its supposed to be metre square not cm square in the above answer .....