There is some water in a cylindrical bucket with a base radius of 3 decimeters. A piece of cylindrical steel with a bottom radius of 10 cm is completely immersed in the water. The water level in the bucket rises by 3 cm. How long is the length of this piece of steel?
有一个底面半径是3分米的圆柱形水桶里装了一些水，把一段底面半径为10厘米的圆柱形钢材完全浸入水里，桶里水面上升了3厘米，这段钢材长多少厘米？
<gadget id="calculator">3 * 10</gadget>
<output>30</output>

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

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

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

<gadget id="calculator">3 / 314</gadget>
<output>3/314 = around 0.009554</output>

<gadget id="calculator">3.14 * 900 * (3/314)</gadget>
<output>27</output>

<result>27</result>