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Question

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. [Assume π=227]


  1. 173.25 cm2

  2. 273.25 cm2

  3. 179.25 cm2

  4. 183.25 cm2


Solution

The correct option is A

173.25 cm2


Inner radius of the hemispherical bowl = 5 cm

Thickness of the bowl = 0.25 cm

Outer radius (r) of the hemispherical bowl = (5 + 0.25) cm

= 5.25 cm

Outer CSA of hemispherical bowl =2πr2

=2×227×(5.25cm)2=173.25 cm2

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