A cylinder and a cone have the same volume and the same base radius. If the height of the cylinder is 9 cm, what is the height of the cone in cm?
一个圆柱和一个圆锥的体积相等，底面半径也相等，如果圆柱的高是9cm，那么圆锥的高是多少cm．
<gadget id="calculator">9 * 3</gadget>
<output>27</output>

<result>27</result>