To use a compass to draw a circle with a circumference of 25.12 cm, what is the distance between the two feet of the compass in cm?
要用圆规画一个周长为25.12厘米的圆，圆规两脚张开的距离是多少厘米．
<gadget id="calculator">25.12 / 3.14 / 2</gadget>
<output>4</output>

<result>4</result>