Ex 13.4, 6 - Find radius of a sphere whose surface area - Area Of Sphere

  1. Chapter 13 Class 9 Surface Areas and Volumes
  2. Serial order wise
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Ex 13.4 , 6 Assume π = 22/7, unless stated otherwise. Find the radius of a sphere whose surface area is 154 cm2. Let r be the radius of the sphere. Surface area = 4𝜋𝑟2 154 cm2 = 4𝜋𝑟2 154 cm2 = 4 ×22/7×𝑟2 154 × 7/(22 × 4) cm2 = 𝑟2 𝑟2 = 12.25 r = √12.25 r = 3.5 Thus, the radius of the sphere is 3.5 cm

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