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in Surface Areas And Volumes by (65.5k points)

A dome of a building is in the form of a hemisphere. From inside, it was white-washed at the cost of Rs. 498.96. If the cost of white-washing is Rs. 2.00 per square metre, find the 

(i) inside surface area of the dome, 

(ii) volume of the air inside the dome.

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(i) Cost of white-washing dome is Rs. 498.96 

Cost of white-washing is Rs. 2 per sq. metre. 

∴ Surface Area = \(\frac{498.96}{2}\) = 249.48 m2

(ii) Surface Area of hemisphere, V = 2πr2

∴ Inner volume of hemisphere dome, V

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