Question

Calculate the volume of a cone for the above figure : (Use $\pi =3$)

• A. $27.7m^3$
• B. $28.8m^3$
• C. $26.8m^3$
• D. $25.55m^3$

Answer 1

The correct option is B $28.8m^3$

Volume of a cone (V) = $\frac{1}{3}\times \pi r^{2}h$

$=\frac{1}{3}\times 3\times r^2\times 0.8$

$Diameter=12m$

$\therefore radius=6m$

$V=\frac{1}{3}\times 3\times 6\times 6\times 0.8$

$=28.8m^3$

So, option B is correct.