The volume of a hemisphere is 24251/2 cm3, Find the radius. ( Take = 227 )

Answer: Option C

$$\begin{array}{rl}& \frac{2}{3}\pi r^3=2425\frac{1}{2}\\ & \frac{2}{3}\times \frac{22}{7}\times r^3=\frac{4851}{2}\\ & r^3=\frac{3\times 7\times 441}{8}\\ & r=\frac{21}{2}\\ & r=10.5\text{ cm}\end{array}$$