Draw the largest circle in a square with side length 10 cm, what is the circumference of the circle in cm?
在一个边长为10厘米的正方形中画一个最大的圆，圆的周长是多少厘米？
<gadget id="calculator">3.14 * 10</gadget>
<output>31.4</output>

<result>31.4</result>