cylinder and a cone have the same volume and the same base area. Given that the height of the cylinder is 9 cm, what is the height of the cone in cm?
一个圆柱和一个圆锥的体积相等，底面积也相等．已知圆柱的高是9厘米，圆锥的高是多少厘米．
<result>27</result>