A piece of rectangular paper with a length of 15 cm and a width of 10 cm, if the largest square is cut out from this paper, what is the perimeter of the square in cm?
一张长15厘米，宽10厘米的长方形纸，如果从这张纸剪去一个最大的正方形，则这个正方形的周长是多少厘米？
<gadget id="calculator">10 * 4</gadget>
<output>40</output>

<result>40</result>