A cone container and a cylinder container have the same inner bottom area, fill the cone container with water, and then pour it into the cylinder container, just enough to fill up (2/3) of the cylinder, the inner height of the cylinder is known 6 cm, what is the height of the cone in cm?
一个圆锥体容器和一个圆柱体容器的内底面积相等，将圆锥体容器内装满水，再倒入圆柱体容器内，正好能倒满圆柱体的(2/3)，已知圆柱体内高6厘米，圆锥体内高多少厘米．
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