A cylinder and a cone with equal volume and base area, if the height of the cylinder is 6 cm, what is the height of the cone?
体积和底面积都相等的圆柱和圆锥，圆柱的高如果是6cm，则圆锥的高是多少．
<gadget id="calculator">6 * 3</gadget>
<output>18</output>

<result>18</result>