A rectangular piece of paper, 5 cm long and 3 cm wide. Cut it into a largest square, what is the perimeter of this square in centimeters.
一张长方形的纸片，长5厘米，宽3厘米．把它剪成一个最大的正方形，这个正方形的周长是多少厘米．
<gadget id="calculator">3 * 4</gadget>
<output>12</output>

<result>12</result>