The circumference of the bottom surface of a cylindrical container is 12.56 cm. When a conical iron block is put into the container, the water level rises by 2 cm. What is the volume of this iron block?
一个圆柱形容器的底面周长是12.56厘米，把一块圆锥形铁块放入容器后水面上升2厘米，这块铁块的体积是多少？
<gadget id="calculator">12.56 / 3.14 / 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>