Book Maths Puzzle Numerical Ability Ratio and Proportion

a cylinder, a hemisphere and a cone are on the base and have the same height,the area of the curved surface are in the ratio???

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Book Other Question

The ratio of the perimeter of an equilateral triangle having an altitude equal to the radius of a circle, to the perimeter of an equilateral triangle inscribed in the circle is???? Everybody in a room shakes hands with everybody else.The total number of handshakes is 66.The total number of persons in a room is