In a cylindrical water storage bucket, put a piece of round steel with a radius of 5 cm vertically. If all of it is put into the water, the water level in the bucket will rise by 9 cm. If the round steel in the water is exposed by 8 cm, the water level in the bucket will drop by 4 cm. Find the volume of the round steel.
在一个圆柱形储水桶里，竖直放入一段半径为5厘米的圆钢．如果把它全部放入水中，桶里的水面就上升9厘米，如果把水中的圆钢露出水面8厘米，桶里的水面就下降4厘米，求圆钢的体积．
<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>