Xiao Ming uses a pencil sharpener to sharpen the pencil, and cuts the tip of the pencil into a cone shape. The length of the cylindrical part of the pencil is 9 times that of the cone part, so what is the volume of the cone part?
小明用转笔刀削铅笔，把铅笔的尖端部分削成圆锥的形状，铅笔的圆柱部分长度是圆锥部分的9倍，那么圆锥部分体积是这支铅笔体积的多少
<gadget id="calculator">1 / 28</gadget>
<output>1/28 = around 0.035714</output>

<result>1/28 = around 0.035714</result>