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Q.

A hemispherical bowl is made of steel, 0.25cm thick. The inner radius of the bowl is 5cm. Find the outer curved surface area of the bowl.


Class: 9


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a

  172cm2

b

  172.25cm2

c

  173cm2

d

  173.25cm2  

answer is D.

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Detailed Solution

Given; Inner radius of bowl is 5cm
Thickness of steel is 0.25cm
So; bowl is made up of 0.25cm thick steel,
⇒ radius = 2πr2
Inner radius of the bowl r = 5cm
Thickness of the steel = 0.25cm
Outer radius of the bowl R = 5cm +0.25cm
    = 5.25cm
Outer CSA of the Hemisphere (i.e., Curved surface area)
= 2πR2
Question Image= 173.25cm2
    
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A hemispherical bowl is made of steel, 0.25cm thick. The inner radius of the bowl is 5cm. Find the outer curved surface area of the bowl.Class: 9