# What will be the Diameter? If

If the volume of a sphere is numerically equal to its surface area, then its diameter is:

- 2 cm
- 3 cm
- 4 cm
- 6 cm

**Answer: (4) 6 cm**

**Explanation:-
Formula –
The volume of the sphere = 4 pai r**

^{3}/3

**And the surface area of the sphere = 4 pai r**

^{2}If the volume of a sphere is numerically equal to its surface area,

Then, 4 pai r^{3}/3 = 4 pai r^{2}

r = 3

Then, the diameter of the sphere = 2 x r = 2 x 3

= 6 cm

Hence, the answer is (4) 6 cm.