Question

A circular well is dug to a depth of 2100 cm with a radius of 14 metres. What is the volume of the earth dug out.
1. 12936 m³
2. 14577 m³
3. 1786 m³
4. 12936 cm³

Answer 1

Correct Answer - Option 1 : 12936 m³

Given

Height of well = 2100 cm

Radius of well = 14 cm

Formula used

Volume of well = πr²h

Where r and h are radius and height.

Calculation

Height of we'll = 2100 cm or 21 m

 volume of earth dug out = (22/7) × 14 × 14 × 21

⇒ 22 × 28 × 21

⇒ 12936 m³

∴ Volume of earth dug out is 12936 m³