There is a piece of cylindrical steel with a length of 1 meter and a bottom radius of 0.2 meters. It is necessary to forge it into a cuboid part with a length of 0.4 meters and a width of 0.2 meters. Assuming that the loss of steel during the forging process is negligible, find the cuboid The height of the part.
现有一段长为1米，底面半径为0.2米的圆柱形钢材，要把它锻造成一个长为0.4米，宽为0.2米的长方体零件，假设锻造过程中钢材的损耗可忽略不计，求长方体零件的高．
<gadget id="calculator">0.2 ** 2</gadget>
<output>0.04</output>

<gadget id="calculator">0.4 * 0.2</gadget>
<output>0.08</output>

<gadget id="calculator">1 / 0.08</gadget>
<output>12.5</output>

<gadget id="calculator">3.14 * 0.04 * 12.5</gadget>
<output>1.57</output>

<result>1.57</result>