The radius of the bottom surface of a cylindrical glass container is 10 cm. If 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?
一个圆柱形玻璃容器的底面半径是10cm，把一个铁球从这个容器的水中取出，水面下降4cm，这个铁球的体积是多少？
<gadget id="calculator">10 ** 2</gadget>
<output>100</output>

<gadget id="calculator">3.14 * 100 * 4</gadget>
<output>1_256</output>

<result>1_256</result>