find the radius of a sphere whose surface area is 154cm

^{2}((pi = frac{22}{7}))-
**A.**

7.00cm -
**B.**

3.50cm -
**C.**

3.00cm -
**D.**

1.75cm

##### Correct Answer: Option B

##### Explanation

Surface area = 154cm^{2} (area of sphere)

4(pi)r^{2} = 154

r(sqrt{frac{154}{4pi}})

= 3.50cm