Use a piece of rectangular paper with a length of 40 cm and a width of 25 cm to cut out the largest square. What is the circumference of this square in cm?
用一张长40厘米，宽25厘米的长方形纸，剪出一个最大的正方形，这个正方形周长多少厘米．
<gadget id="calculator">25 * 4</gadget>
<output>100</output>

<result>100</result>