Question

The radius of the base of a right circular cone is 21 cm and its height is 20 cm. Find its volume.

• A. $3300c{m}^2$
• B. $1914c{m}^2$
• C. $1386c{m}^2$
• D. $26720c{m}^2$

Answer 1

The correct option is B $1914c{m}^2$


Given: Radius of the cone, r = 21 cm
Height of the cone, h = 20 cm
Volume of cone = $\frac{1}{3}\pi r^{2}h$
= $\frac{1}{3}\times \frac{22}{7}\times 21\times 21\times 20$
= $22\times 21\times 20$
= $9240c{m}^3$