Given:

Diameter = 4 m

Radius = 2 m

Height = 21 m

\( V = \Pi r^{2}h \) \( \Rightarrow \Pi (2)*(2)*(21) \) \( \Rightarrow V = 84\Pi \)

The volume of soil dug from well = volume of earth used to form the embankment

\( \Rightarrow 84\Pi = \Pi (5^{2} – 2^{2})h \) \( h = \frac{84}{5 – 4} \) \( \Rightarrow \frac{84}{21} \) \( \Rightarrow 4m \)

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