In a cylindrical water storage bucket, put a piece of round steel with a radius of 5 cm into the water, and the water level will rise by 9 cm; when the round steel is pulled out of the water surface by 8 cm, the water will drop by 4 cm. Find the volume of the round bar.
在一个圆柱形储水桶里，把一段半径是5厘米的圆钢全部放入水中，水面上升9厘米；把圆钢竖着拉出水面8厘米后水就下降4cm．求圆钢的体积．
<gadget id="calculator">5 ** 2</gadget>
<output>25</output>

<gadget id="calculator">3.14 * 25 * 27</gadget>
<output>2_119.5</output>

<result>2_119.5</result>