The volume and bottom surface of a cylinder and a cone are respectively equal. The height of the cylinder is 12 cm. What is the height of the cone in cm?
一个圆柱与一个圆锥的体积和底面分别相等，已知圆柱的高是12cm，圆锥的高应是多少cm．
<gadget id="calculator">12 * 3</gadget>
<output>36</output>

<result>36</result>