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Ex 13.4, 1 - Find surface area of a sphere of radius - Ex 13.4

  1. Chapter 13 Class 9 Surface Areas and Volumes
  2. Serial order wise
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Ex 13.4, 1 Assume π = 22/7, unless stated otherwise. Find the surface area of a sphere of radius: 10.5 cm Radius of sphere = r = 10.5 cm Surface area of sphere = 4𝜋r2 = (4×22/7×10.5×10.5)cm2 = 1386 cm2 Ex 13.4, 1 Assume π = 22/7, unless stated otherwise. Find the surface area of a sphere of radius: (ii) 5.6 cm Radius of sphere = r = 5.6 cm Surface area of sphere = 4𝜋r2 = (4×22/7×5.6×5.6)cm2 = 394.24 cm2 Ex 13.4, 1 Assume π = 22/7, unless stated otherwise. Find the surface area of a sphere of radius: (iii) 14cm Radius of sphere = r = 14 cm Surface area of sphere = 4𝜋r2 = (4×22/7×14×14)cm2 = (4×22×2×14)cm2 = 2464 cm2

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