In a cylindrical water storage tank, if a piece of cylindrical steel with a base radius of 5 cm is put into the water, the water level will rise by 9 cm; when the steel is pulled out of the water by 8 cm vertically, the water level will drop by 4 cm. What is the volume of steel?
在一个圆柱形的储水箱里，把一段底面半径是5厘米的圆柱形钢材全部放入水中，水面就上升9厘米；把钢材竖着拉出水面8厘米后，水面就下降4厘米．钢材的体积是多少？
<gadget id="calculator">8 / 4</gadget>
<output>2</output>

<gadget id="calculator">5 * 5 * 3.14 * 2</gadget>
<output>157</output>

<gadget id="calculator">157 * 9</gadget>
<output>1_413</output>

<result>1_413</result>