The diameter of the bottom surface of a circular glass container is 10 cm. After taking out an iron block completely immersed in the water in the container, the water level drops by 2 cm. What is the volume of the iron block?
一个圆形玻璃容器的底面直径是10cm，把一块完全浸在这个容器的水中的铁块取出后，水面下降2cm，这块铁的体积是多少？
<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<gadget id="calculator">5 ** 2</gadget>
<output>25</output>

<gadget id="calculator">3.14 * 25 * 2</gadget>
<output>157</output>

<result>157</result>