is the quantity of concrete required to make 70 cylindrical pillars of radius $5 c m$ and height $10 m$ .

6.5 m^{3}

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5.5 m^{3}

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6 m^{3}

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Solution

The correct option is B $5.5 m^{3}$
Radius of base of cylinder
$= 5 c m$
$= \frac{5}{100} m$

Height of cylinder
$= 10 m$

Volume of 1 pillar
$= π r^{2} h = \frac{22}{7} \times (\frac{5}{100})^{2} \times 10$

Volume of 70 such pillars
$= 70 \times π r^{2} h = 70 \times \frac{22}{7} \times (\frac{5}{100})^{2} \times 10 = 5.5 m^{3}$

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is the quantity of concrete required to make 70 cylindrical pillars of radius 5 cm and height 10 m.

The correct option is B 5.5 m3Radius of base of cylinder =5 cm =5100 m Height of cylinder =10 m Volume of 1 pillar =πr2h=227×(5100)2×10 Volume of 70 such pillars =70 × πr2h=70×227×(5100)2×10=5.5 m3

is the quantity of concrete required to make 70 cylindrical pillars of radius $5 c m$ and height $10 m$ .