Use a cylindrical container with a bottom diameter of 20 cm and a height of 17 cm to measure the volume of an iron ball. The water in the container is 2 cm from the mouth of the cup. When the iron ball is placed in the container, some water overflows. After taking it out, the water level drops by 5 cm, find the volume of the iron ball.
用一个底面直径是20厘米、高17厘米的圆柱形容器测量一个铁球的体积，容器中装的水距杯口2厘米，当铁球放入容器中，有部分水溢出，当把铁球取出后，水面下降了5厘米，求铁球的体积．
<gadget id="calculator">20 / 2</gadget>
<output>10</output>

<gadget id="calculator">10 ** 2</gadget>
<output>100</output>

<gadget id="calculator">3.14 * 100 * 5</gadget>
<output>1_570</output>

<result>1_570</result>