If the cylinder and the cone have the same volume and base area, the height of the cylinder is 6 cm, what is the height of the cone in cm?
如果圆柱和圆锥的体积和底面积都相等，圆柱的高是6cm，圆锥的高是多少cm．
<gadget id="calculator">6 * 3</gadget>
<output>18</output>

<result>18</result>