cylinder and a cone have the same volume and base area respectively, and the height of the cylinder is 3 cm, what is the height of the cone in cm?
一个圆柱和圆锥的体积与底面积分别相等，圆柱的高为3cm，则圆锥的高为多少cm．
<gadget id="calculator">3 * 3</gadget>
<output>9</output>

<result>9</result>