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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 dome, (ii) Volume of air inside the dome.

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eginarrayl	extGiven that,\ 	extCost of white washsed =498.96 Rs\ 	extRate of white washed =2 Rs per m^2\ 	extArea of dome =frac498.962 m^2 =249.48 m^2\ 	extArea of dome =2pi r^2=249.48 m^2, Rightarrow r=6.30 m\ 	extVolume of hemispher=frac23pi r^3=523.4 m^3endarray

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Deependra Verma

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