A cylindrical glass container has a base diameter of 10 cm. When an iron ball is taken out of the water in the container, the water level drops by 4 cm, what is the volume of the iron ball in cubic centimeters?
一个圆柱形玻璃容器的底面直径是10厘米．把一个铁球从这个容器的水中取出后，水面下降4厘米，这个铁球的体积是多少立方厘米．
<gadget id="calculator">10 / 2</gadget>
<output>5</output>

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

<gadget id="calculator">3.14 * 25 * 4</gadget>
<output>314</output>

<result>314</result>