Cut a circular piece of paper with a circumference of 31.4 cm, and determine the distance between the two feet of the compass.
剪一个周长是31.4厘米的圆形纸片，圆规两脚间的距离需要定为多少长．
<gadget id="calculator">31.4 / 3.14 / 2</gadget>
<output>5</output>

<result>5</result>