Question

If the volume and surface area of the sphere is numerically equal, then its radius is :

• A. $2units$
• B. $3units$
• C. $4units$
• D. $5units$

Answer 1

The correct option is B $3units$

Let the radius of sphere be ${}^{\prime }{r}^{\prime }$ units.

Given, Volume of sphere $=$ Surface area of sphere

$\frac{4}{3}\pi r^3=4\pi r^2$

$r=3$ units