Draw the largest circle on a piece of rectangular paper with a length of 15 cm and a width of 10 cm. What is the circumference of this circle in cm?
在一张长15厘米、宽10厘米的长方形纸上画一个最大的圆，这个圆的周长是多少厘米？
<gadget id="calculator">3.14 * 10</gadget>
<output>31.4</output>

<result>31.4</result>