A cylindrical piece of steel has a bottom diameter of 4 cm and a length of 80 cm. Cast it into a cylindrical part with a diameter of 20 cm. What is the height of this part in cm?
一根圆柱形钢材，底面直径是4厘米，长是80厘米，将它铸成直径是20厘米的圆柱形零件，这个零件的高是多少厘米？
<gadget id="calculator">4 / 2</gadget>
<output>2</output>

<gadget id="calculator">2 ** 2</gadget>
<output>4</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">80 / 314</gadget>
<output>40/157 = around 0.254777</output>

<gadget id="calculator">3.14 * 4 * (40/157)</gadget>
<output>3.2</output>

<result>3.2</result>