Question

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

Answer 1

r≈3.5cm
A Surface area

154cm²
Using the formula
A=4πr2
Solving forr
r=1/2rootAπ=1/2x154
π≈3.5007cm

Answer 2

Hello there !!!

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Radius = r

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Surface area = 4/3πr²

4 × 22/7 ×r² = 154 cm²

22/7 ×r² = 154 /4

= 38.5

r² = 38.5 x 7 /22

= 12.25

r = √12.25

= 3.5 cm

Hence ,

radius is 3.5 cm

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