A cylinder and a cone have the same base area and volume, if the height of the cylinder is 10 cm, what is the height of the cone?
底面积和体积分别相等的圆柱和圆锥，如果圆柱的高是10cm，那么圆锥的高是多少．
<gadget id="calculator">10 * 3</gadget>
<output>30</output>

<result>30</result>