Ex 13.8, 7 - Find volume of a sphere whose surface area - Ex 13.8

  1. Chapter 13 Class 9 Surface Areas and Volumes
  2. Serial order wise
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Ex 13.8, 7 Find the volume of a sphere whose surface area is 154 cm2 Let radius of the sphere = r cm Given, Surface area = 154 cm2 4 πr2 = 154 4 × 22/7 × r2 = 154 r2 = (154×7)/(4×22) r2 = 12.25 r = √12.25 r = 3.5 cm Volume of sphere = 4/3 πr3 = (4/3 ×22/7×3.5×3.5×3.5) cm3 = 179.67 cm3

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