cylindrical glass cylinder with a bottom diameter of 20cm, put a steel ball into the water, the water level in the cylinder rises by 2cm, find the volume of the steel ball.
一个圆柱形玻璃缸，底面直径20cm，把一个钢球放入水中，缸内水面上升了2cm，求这个钢球的体积．
<gadget id="calculator">20 / 2</gadget>
<output>10</output>

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

<gadget id="calculator">3.14 * 100 * 2</gadget>
<output>628</output>

<result>628</result>