The height of a cone is \( 20 \mathrm{~cm} \). A small cone is cut off from the top by a plane p...

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The height of a cone is \( 20 \mathrm{~cm} \). A small cone is cut off from the top by a plane parallel to the base. If its volume be \( 1 / 125 \) of the volume of the original cone, determine at what height above the base the section is made.
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