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The Dome of a Building is in the Form of a Hemisphere. Its Radius is 63 Dm. Find the Cost of Painting It at the Rate of Rs. 2 per Sq. M. - CBSE Class 9 - Mathematics

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Question

The dome of a building is in the form of a hemisphere. Its radius is 63 dm. Find the cost of
painting it at the rate of Rs. 2 per sq. m. 

Solution

Dome Radius - 63d m - 6.3m 

Inner S.A of  dome - `2πr^2 - 2 × 22/7 × (6.3)^2 - 249.48 m^2`

Now . cost of `1m^2` = Rs. 2.

∴ Cost of `249.48m^2`- Rs [2 × 249.48]

- Rs.498.96.

 

  

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APPEARS IN

 RD Sharma Solution for Mathematics for Class 9 by R D Sharma (2018-19 Session) (2018 to Current)
Chapter 21: Surface Areas and Volume of a Sphere
Ex.21.10 | Q: 6 | Page no. 8
Solution The Dome of a Building is in the Form of a Hemisphere. Its Radius is 63 Dm. Find the Cost of Painting It at the Rate of Rs. 2 per Sq. M. Concept: Surface Area of a Sphere.
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