Q5 of 70 Page 21

Find the volume of a sphere whose surface area is 154 cm2.

Surface area of a sphere = 4πr2


Given, surface area is 154 cm2


⇒ 4 × (22/7) × r2 = 154


⇒ r2 = 49/4


⇒ r = 3.5 cm


Volume of a sphere = (4/3)πr3


⇒ Volume of the given sphere = (4/3) π × 3.53 = 179.66 cm3


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