If a metal cylinder with a base diameter of 20 cm and a height of 10 cm is completely submerged in a cylindrical tank with a diameter of 40 cm, how many centimeters will the water level of the tank rise?
将一个底面直径是20厘米，高为10厘米的金属圆柱体，全部浸没在直径是40厘米的圆柱形水槽中，水槽水面会升高多少厘米？
<gadget id="calculator">20 / 2</gadget>
<output>10</output>

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

<gadget id="calculator">40 / 2</gadget>
<output>20</output>

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

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

<gadget id="calculator">10 / 1_256</gadget>
<output>5/628 = around 0.007962</output>

<gadget id="calculator">3.14 * 100 * (5/628)</gadget>
<output>2.5</output>

<result>2.5</result>