Put a metal cone with a bottom diameter of 4dm into a cylindrical cup with a bottom diameter of 80cm and completely submerge it. At this time, the water level rises by 4cm. What is the height of the metal cone in centimeters?
把一个底面直径为4dm的金属圆锥，投入到底面直径为80cm的圆柱形杯内完全浸没，这时水面上升4cm．金属圆锥的高是多少厘米？
<gadget id="calculator">80 / 2</gadget>
<output>40</output>

<gadget id="calculator">40 ** 2</gadget>
<output>1_600</output>

<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<gadget id="calculator">4 * 5</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">3 / 1_256</gadget>
<output>3/1_256 = around 0.002389</output>

<gadget id="calculator">3.14 * 1_600 * 4 * (3/1_256)</gadget>
<output>48</output>

<result>48</result>