# Cylindrical pillars are to be made for a flat whose radius is

Cylindrical pillars are to be made for a flat whose radius is 15cm and height is 3.5m. What is the total amount of concrete (in cm^3) required to make 15 identical pillars? (Take π = $$\frac{22}{7}$$)

A. 3513600

B. 3712500

C. 4125300

D. 3917800

The question was asked by my college director while I was bunking the class.

My question is based upon Volume of a Cylinder in chapter Surface Areas and Volumes of Mathematics – Class 9

Correct choice is B. 3712500

Explanation: Volume of one cylindrical pillar = πr^2h

= $$\frac{22}{7}$$ * 15 * 15 * 350

= 247500cm^3

Hence, total volume of 15 pillars = 15 * 247500

= 3712500cm^3

Therefore, the total amount of concrete required to make 15 identical pillars = 3712500cm^3.