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

Transcript

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 r2 = 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 r3 = (4/3 22/7 3.5 3.5 3.5) cm3 = 179.67 cm3

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