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RS Aggarwal Solutions Class 9 Mathematics Solutions for Volume And Surface Area Of Solids Exercise 15B in Chapter 15 - Volume And Surface Area Of Solids

Question 3 Volume And Surface Area Of Solids Exercise 15B

The pillars of a temple are cylindrically shaped. Each pillar has a circular base of radius 20cm and height 10m. How much concrete mixture would be required to build 14 such pillars?

Answer:

ANSWER:

It is given that

Radius of pillar = 20cm = 0.2m

Height of pillar = 10m

We know that

Volume of one pillar = πr2h

By substituting the values

Volume of one pillar = (22/7) × (0.2)2 × 10

So we get

Volume of one pillar = 1.2571 m3

So the volume of concrete mixture in 14 pillars = 14 × 1.2571 = 17.6m3

Therefore, the volume of concrete mixture required in 14 pillars is 17.6m3.

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