70 cylindrical pillars each of radius 10 cm and height 20 m would require $m^{3}$ of concrete.

4.4

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0.44

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Solution

The correct option is B 44
It is given that r = $\frac{10}{100}$ m and h = 20 m.
Volume of cylinder = $π r^{2} h$ .
Volume of concrete required for 1 pillar
= $\frac{22}{7} \times \frac{10}{100} \times \frac{10}{100} \times 20$
Volume of concrete required for 70 such pillars
= $70 \times \frac{22}{7} \times \frac{10}{100} \times \frac{10}{100} \times 20$
$= 44 m^{3}$

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70 cylindrical pillars each of radius 10 cm and height 20 m would require m3 of concrete.

The correct option is B 44It is given that r = 10100 m and h = 20 m. Volume of cylinder = πr2h. Volume of concrete required for 1 pillar = 227 ×10100×10100×20 Volume of concrete required for 70 such pillars = 70 × 227 ×10100×10100×20 =44 m3

70 cylindrical pillars each of radius 10 cm and height 20 m would require $m^{3}$ of concrete.