A cone and a cylinder have the same base and volume, then the height of the cylinder is 6 cm, what is the height of the cone in cm?
一个圆锥与圆柱等底等体积，那么圆柱的高是6厘米，圆锥的高是多少厘米．
<gadget id="calculator">6 * 3</gadget>
<output>18</output>

<result>18</result>