In a rectangular water storage bucket, put a piece of round steel with a diameter of 10 cm into the water, and the water level will rise by 9 cm; pull the round steel vertically out of the water surface by 8 cm, and the water level will drop by 4 cm. What is the volume of the round bar in cubic centimeters?
在一个长方形储水桶里，把一段直径是10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，水面就下降4厘米．圆钢的体积是多少立方厘米．
<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">78.5 * (4/9)</gadget>
<output>34.888889</output>

<gadget id="calculator">200 / 34.888889</gadget>
<output>5.732484</output>

<gadget id="calculator">3.14 * 5.732484</gadget>
<output>18</output>

<gadget id="calculator">78.5 * 18</gadget>
<output>1_413</output>

<result>1_413</result>