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find the radius of a sphere whose surface area is 154cm2 ((pi = frac{22}{7}))

find the radius of a sphere whose surface area is 154cm² ((pi = frac{22}{7}))

A.
7.00cm
B.
3.50cm
C.
3.00cm
D.
1.75cm

Correct Answer: Option B

Explanation

Surface area = 154cm² (area of sphere)
4(pi)r² = 154
r(sqrt{frac{154}{4pi}})
= 3.50cm