Question

how many cubic metres of earth must be dug out to sink a well 16 m in depth and 7m in diameter

Answer 1

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Answer 2

Step 1:

Given Data.

Sink a well = 16 m depth.

Diameter = 7 m

Step 2:

So we come to know  

Radius = Diameter / 2= 7 / 2 m

Height= 16m

Step 3:

Using the Formula

Volume of cylinder = π $\bold{r ^ 2h}$

Volume of cylinder = 22 / 7 x 7 / 2 x 7 / 2 x 16

Volume of cylinder = 22 / 7 x 49 / 4 x 16

Volume of cylinder =616 $m^2$