After taking out a conical metal part with a bottom diameter of 20 cm from a cylindrical tank with a diameter of 40 cm, the water level drops by 1 cm. What is the height of this conical part?
从一个直径为40厘米的圆柱形水槽中，取出一个底面直径是20厘米的圆锥形金属零件后，水面下降了1厘米．这个圆锥形零件的高是多少？
<gadget id="calculator">40 / 2</gadget>
<output>20</output>

<gadget id="calculator">20 ** 2</gadget>
<output>400</output>

<gadget id="calculator">3.14 * 400 * 1</gadget>
<output>1_256</output>

<gadget id="calculator">20 / 2</gadget>
<output>10</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">1_256 * (3/314)</gadget>
<output>12</output>

<result>12</result>