In a cylindrical bucket with a bottom diameter of 60 cm, a section of cylindrical steel with a radius of 10 cm is submerged in water. When the steel is taken out of the bucket, the water level in the bucket drops by 5 cm. This section of steel has how long?
在一只底面直径是60厘米的圆柱形水桶里，有一段半径为10厘米的圆柱形钢材浸没在水中，当钢材从储水桶里取出时，桶里的水面下降了5厘米，这段钢材有多长？
<gadget id="calculator">60 / 2</gadget>
<output>30</output>

<gadget id="calculator">30 ** 2</gadget>
<output>900</output>

<gadget id="calculator">3.14 * 900 * 5</gadget>
<output>14_130</output>

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

<gadget id="calculator">3.14 * 100</gadget>
<output>314</output>

<gadget id="calculator">14_130 / 314</gadget>
<output>45</output>

<result>45</result>