Question

find the volume of a sphere whose surface area is 154 cm square​

Answer 1

Let the radius of the sphere be r cm

Surface area of the sphere = 154 sq cm

4πr^2 = 154

2πr^2 = 77

2 × 22/7 × r^2 = 77

2 × 2/7 × r^2 = 7

r^2 = 49/4

r = 7/2 = 3.5cm

Volume of sphere = 4/3πr^3

= 4/3 * 22/7 * 7/2 * 7/2 * 7/2

= 11*7*7/3

= 179.66 cm^3

Answer 2

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