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Ex 13.4, 2 - Find surface area of a sphere of diameter - Area Of Sphere

  1. Chapter 13 Class 9 Surface Areas and Volumes
  2. Serial order wise
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Ex 13.4, 2 Assume ฯ€ = 22/7, unless stated otherwise. Find the surface area of a sphere of diameter: 14 cm Radius of sphere = r = ๐ท๐‘–๐‘Ž๐‘š๐‘’๐‘ก๐‘’๐‘Ÿ/2= (14/2) = 7 cm Surface area of sphere = 4๐œ‹r2 = (4ร—22/7ร—7ร—7)cm2 = (4ร—22ร—1ร—7)cm2 = 616 cm2 Ex 13.4, 2 Assume ฯ€ = 22/7, unless stated otherwise. Find the surface area of a sphere of diameter: (ii) 21 cm Radius of sphere = r = ๐ท๐‘–๐‘Ž๐‘š๐‘’๐‘ก๐‘’๐‘Ÿ/2 = (21/2) cm = 10.5 cm Surface area of sphere = 4๐œ‹r2 = (4ร—22/7ร—10.5ร—10.5)cm2 = 1386 cm2 Ex 13.4, 2 Assume ฯ€ = 22/7, unless stated otherwise. Find the surface area of a sphere of diameter: (iii) 3.5 cm Radius of sphere = r = ๐ท๐‘–๐‘Ž๐‘š๐‘’๐‘ก๐‘’๐‘Ÿ/2 r = (3.5/2) cm = 1.75 cm Surface area of sphere = 4๐œ‹r2 = (4ร—22/7ร—1.75ร—1.75)cm2 = 38.5 cm2

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