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Discussion

Quantitative Reasoning Preparation for GRE
(4)

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Which one of the following has the smallest surface area?

 
A right circular cone with height and diameter of the base, both equal to 8 cm.
A hemisphere of diameter 8 cm.
A right circular cylinder with height and diameter of the base, both equal to 8 cm.
A cube with sides equal to 8 cm.

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Satish

The answer is the first option. Cone has a lower surface area than the hemisphere comparing the total surface areas cone has around 400 and hemisphere has 600