# What is the Radius? If

If the surface area of a sphere is 346.5 cm square, then is radius [ taking p = 22/7 ] is

- 7 cm
- 3.25 cm
- 5.25 cm
- 9 cm

**Answer: (3) 5.25 cm**

**Explanation:-**

**Formula-**

The surface area of the sphere = 4 x pai x r^{2}According to the question,

4 x pai x r^{2} = 346.5

r^{2} = 346.5/4 x pai

r^{2} = 346.5 x 7 /22 x 4 ( pai = 22/7 )

r^{2} = 27.56

Square root on both side,

r = 5.25 cm

Hence, the answer is (3) 5.25 cm.