The volume and area of the base of a cylinder are equal to the volume and area of the base of the cone respectively. The height of the cylinder is 9 cm. What is the height of the cone in cm?
一个圆柱体体积和底面积分别与圆锥的体积和底面积相等，圆柱的高是9厘米，圆锥的高是多少厘米．
<gadget id="calculator">9 * 3</gadget>
<output>27</output>

<result>27</result>