1. Radius of hemisphere is thrice than that of a sphere. What is the ratio of total surface area of hemisphere to that of sphere?





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  • By: anil on 05 May 2019 02.27 am
    Let radius of sphere = $$r$$ cm and radius of hemisphere = $$3r$$ cm Ratio of surface area = $$frac{3pi (3r)^2}{4pi r^2}$$ = $$frac{27}{4}$$ => Ans - (C)
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