A conical container with a bottom radius of 8 cm and a height of 12 cm is filled with water, and then water is poured into a cylindrical container of the same height as the bottom. What is the height of the water surface in cm?
一个圆锥形容器，底面半径8cm，高12cm，在里面装满水，再把水倒入一个与它等底等高的圆柱形容器中，水面高多少cm．
<gadget id="calculator">12 / 3</gadget>
<output>4</output>

<result>4</result>