In a cylindrical water storage tank with a bottom radius of 20 cm, there is a conical steel material with a radius of 10 cm submerged in water. When the steel was taken out of the bucket, the water in the bucket dropped by 2 cm. What is the height of this conical steel bar?
在一只底面半径是20厘米的圆柱形储水桶里，有一个半径是10厘米的圆锥形钢材浸没在水中．当钢材从储水桶中取出时，桶里的水下降了2厘米．这个圆锥形钢材的高是多少厘米？
<gadget id="calculator">20 ** 2</gadget>
<output>400</output>

<gadget id="calculator">3.14 * 400 * 2</gadget>
<output>2_512</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">2_512 * (3/314)</gadget>
<output>24</output>

<result>24</result>