Q16 of 26 Page 183

Whole surface area of a solid hemisphere is equal to the curved surface area of the solid sphere. Let us write the ratio of lengths of radius of hemisphere and sphere.


Whole surface area of a solid hemisphere of radius r1 = 2×π×r12 + π×r12 = 3×π×r12



We know that surface area of sphere = 4×π×r22


3×π×r12 = 4×π×r22


⇒


⇒ r1:r2 = 2:√3


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