CBSE Class 9 Answered
A hemispherical dome of a building is to be white washed and the total cost of white wash of dome building is Rs. 924 at the rate of Rs. 3 per m2 then find the
(a) Surface area of hemisphere
(b) Volume of air in the dome
Asked by Topperlearning User | 07 Apr, 2014, 12:15: PM
Expert Answer
(i) Total cost of white wash = Rs. 924
Cost per m2= Rs. 3
Total area to be white wash = 
= 308 m2
Surface area of hemisphere = 308 m2
(ii) Now, surface area of hemisphere = 308 m2
2
r2 = 308 m2
r = 7 m
Volume of hemisphere = 
718.66 m2 air is present inside the dome.
Answered by | 07 Apr, 2014, 02:15: PM
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