Two cylinders and cones of equal volume have the same base area. The height of the cylinder is 12 cm. What is the height of the cone?
两个体积相等的圆柱和圆锥底面积相等，圆柱高12厘米，圆锥高多少．
<gadget id="calculator">12 * 3</gadget>
<output>36</output>

<result>36</result>