Two cylinders and cones have the same base area and volume respectively. The height of the cylinder is 4 cm. What is the height of the cone?
两个底面积和体积分别相等的圆柱和圆锥，圆柱的高为4厘米，圆锥的高是多少．
<gadget id="calculator">4 * 3</gadget>
<output>12</output>

<result>12</result>