Question

How many cubic metres of earth must be dug to construct a well 7 m deep and of diameter 2.8 m?

Answer 1

Step-by-step explanation:

Height = 7m

Diameter = 2.8 m

Then, radius = 2.8/2 m = 1.4 m

Now

Volume of cylinder =¶r²h

= 22/7×1.4×1.4×7 m

= 22×1.4×1.4 m³

= 43.12 m³

Thus, 43.12 m³ of earth must be dug to construct a well 7 m deep and of diameter 2.8 m.

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Answer 2

Let the dug well is shaped in cylinder so

Volume of cylinder

r=2.8/2

r=1.4m

h=7m

=πr²h

22/7x1.4x1.4x7

=22x1.96

=43.12 m³

in cubic meter