The area and volume of the bottom of the cylinder and the cone are equal respectively, the height of the cylinder is 6 cm, and the height of the cone is in cm.
圆柱和圆锥底面积与体积分别相等，圆柱高6厘米，圆锥高多少厘米．
<gadget id="calculator">6 * 3</gadget>
<output>18</output>

<result>18</result>