Cut out the largest square from a rectangle with a length of 6 cm and a width of 5 cm. What is the perimeter of the square in cm?
从长6厘米，宽5厘米的长方形中截出一个最大的正方形，正方形的周长是多少厘米
<gadget id="calculator">5 * 4</gadget>
<output>20</output>

<result>20</result>