A conical container is filled with water, and the water is poured into a cylindrical container with a bottom diameter of 4 decimeters, and the height of the water surface is exactly 2 decimeters. What is the volume of this conical container?
一个圆锥形容器中装满了水，把水倒入一个底面直径是4分米的圆柱容器中，水面高度正好是2分米．这个圆锥容器的容积是多少？
<gadget id="calculator">4 / 2</gadget>
<output>2</output>

<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

<gadget id="calculator">3.14 * 4 * 2</gadget>
<output>25.12</output>

<result>25.12</result>