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The height of a cone is 20cm. A small cone is cut off from the top by a plane parallel to the base.

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The height of a cone is 20cm. A small cone is cut off from the top by a plane parallel to the base. If its volumes be 1/25 of the volume of the original cone, determine at what height above base the section is made

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V AB be a cone of height h1 = VO1 = 20cm

Height at which section is made = 20 - 4 =16cm

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