Ex 13.4, 8 - A hemispherical bowl is made of steel 0.25 cm - Ex 13.4

  1. Chapter 13 Class 9 Surface Areas and Volumes
  2. Serial order wise
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Ex 13.4, 8 A hemispherical bowl is made of steel, 0.25 cm thick. The inner radius of the bowl is 5 cm. Find the outer curved surface area of the bowl. We need to find outer curved surface area hence we need to be find Outer Radius Given Inner radius = 5 cm Hence Outer radius = r = 5 + 0.25 cm = 5.25cm ∴ Outer curved surface = 2𝜋𝑟2 = (2×22/7×5.25×5.25) cm2 = 173.25 cm2

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