Zhang Ming wants to cut out the largest circle from a piece of rectangular paper with a length of 50 cm and a width of 40 cm. What is the circumference of this circle in centimeters?
张鸣要从一张长50厘米、宽40厘米的长方形纸上剪下一个最大的圆，这个圆的周长是多少厘米？
<gadget id="calculator">3.14 * 40</gadget>
<output>125.6</output>

<result>125.6</result>