The volume of the cylinder and the cone are equal, and the area of the base is also equal. If the height of the cylinder is 3 cm, what is the height of the cone?
圆柱和圆锥的体积相等，底面积也相等，若圆柱的高是3厘米，则圆锥的高是多少．
<gadget id="calculator">3 * 3</gadget>
<output>9</output>

<result>9</result>