Cut out the longest square from a rectangular piece of paper with a length of 10 cm and a width of 4 cm. What is the perimeter of this square in cm?
在一张长10厘米，宽4厘米的长方形纸片上，剪下一个最长的正方形，这个正方形的周长是多少厘米
<gadget id="calculator">4 * 4</gadget>
<output>16</output>

<result>16</result>