To draw a circle with a circumference of 28.26 cm, what is the distance between the feet of the compass in cm
要画一个周长是28.26厘米的圆，圆规两脚间的距离是多少厘米
<gadget id="calculator">28.26 / 3.14 / 2</gadget>
<output>4.5</output>

<result>4.5</result>