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

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Solution

The shape of well is considered to be a cylinder.

Given, height $= 7 m$ and diameter $= 2.8 m$

Radius $= \frac{diameter}{2} = \frac{2.8}{2} = 1.4 m$
Volume of earth dug out = $π r^{2} h$ $= \frac{22}{7} \times (1.4)^{2} \times 7$ $= 43.12 m^{3}$

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

The shape of well is considered to be a cylinder.Given, height =7 m and diameter =2.8 mRadius =diameter2=2.82=1.4 mVolume of earth dug out = πr2h =227×(1.4)2×7 =43.12m3

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

The shape of well is considered to be a cylinder.

Given, height $= 7 m$ and diameter $= 2.8 m$

Radius $= \frac{diameter}{2} = \frac{2.8}{2} = 1.4 m$
Volume of earth dug out = $π r^{2} h$ $= \frac{22}{7} \times (1.4)^{2} \times 7$ $= 43.12 m^{3}$