A cylinder and a cone have the same base area and volume respectively, the height of the cylinder is 4 cm, and the height of the cone is cm.
一个圆柱与一个圆锥的底面积和体积分别相等，已知圆柱的高是4cm，圆锥的高是多少cm．
<gadget id="calculator">4 * 3</gadget>
<output>12</output>

<result>12</result>