A conical container with a height of 12 cm is filled with water, and all the water is poured into an empty cylindrical container with the same area as its bottom. What is the height of the water surface in the cylindrical container in cm? (The thickness of the container is ignored)
一个高12cm的圆锥形容器装满水，把水全部倒入和它底面积相等的圆柱形空容器里，圆柱形容器的水面高多少cm．(容器的厚度忽略不计)
<gadget id="calculator">12 / 3</gadget>
<output>4</output>

<result>4</result>