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Ex 13.8, 6 - A hemispherical tank is made up of an iron - Ex 13.8

  1. Chapter 13 Class 9 Surface Areas and Volumes
  2. Serial order wise
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Ex 13.8, 6 A hemispherical tank is made up of an iron sheet 1 cm thick. If the inner radius is 1 m, then find the volume of the iron used to make the tank. Inner radius = r1 = 1 m Outer radius = r2 = 1 m + 1 cm = 1 m + 1/100 m = 1 m + 0.01 m = 1.01 m Volume of iron used = Volume of outer hemisphere – Volume of inner hemisphere = 2/3 πr23 – 2/3 πr13 = 2/3 π (r23 – r13 ) = 2/3 ×22/7 × [(1.01)3 – (1)3] m3 = 44/21 × (1.030301 – 1) m3 = (44/21 ×0.030301) m3 = 0.06348 m3

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