The diameter of the bottom surface of a circular glass container is 8 cm. After taking out an iron block completely immersed in the water in the container, the water level drops by 3 cm. What is the volume of the iron block?
一个圆形玻璃容器的底面直径是8cm，把一块完全浸在这个容器的水中的铁块取出后，水面下降3cm，这块铁的体积是多少？
<gadget id="calculator">8 / 2</gadget>
<output>4</output>

<gadget id="calculator">4 ** 2</gadget>
<output>16</output>

<gadget id="calculator">3.14 * 16 * 3</gadget>
<output>150.72</output>

<result>150.72</result>