Xiao Cong draws a circle with a compass. If the distance between the two feet of his compass is 5 centimeters, what is the circumference of the circle in centimeters?
小聪用圆规画一个圆，如果他的圆规两脚间的距离为5厘米，那么这个圆的周长是多少厘米．
<gadget id="calculator">3.14 * 5 * 2</gadget>
<output>31.4</output>

<result>31.4</result>