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A cone is cut by a plane paraller to the base and upper part is removed if the curved surface area of upper cone

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A cone is cut by a plane paraller to the base and upper part is removed if the curved surface area of upper cone is 1 / 9 times the curved surface of original cone. fine the ratio of line segment to which the cone's height is divided by the plane. 

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Substituting  (ii)  in  (i)

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