Question

do it plz
how much earth can be dug out in order to sink a well which is 10m inside diameter and 28 m deep?

Answer 1

volume of the cylinder = 2πr²h
=2×22/7×14×14×28
=2×22×2×14×28
=88×14×28
=34496m³

therefore a pit of volume 34496m³ is to be dug...

Answer 2

Given:

Diameter of well = 10 m  

Depth of well = 28 m

To Find:

how much earth can be dug out in order to sink a well which is 10m inside diameter and 28 m deep?

Solution:

Diameter of well = 10 m  

Radius of well = $\frac{10}{2} = 5 m$

Depth of well = 28 m

Volume of well = $\pi r^2 h = \frac{22}{7} \times 5^2 \times 28 =2200$

Hence the 2200 cubic m of earth can be dug out in order to sink a well which is 10m inside diameter and 28 m deep.