For a cone and a cylinder with the same base area and volume, if the height of the cylinder is 3 cm, what is the height of the cone in cm?
底面积和体积分别相等的圆锥和圆柱，若圆柱的高是3厘米，则圆锥的高是多少厘米．
<gadget id="calculator">3 * 3</gadget>
<output>9</output>

<result>9</result>