Xiaoli uses a compass to draw a circle with a circumference of 15.7 cm. What is the distance in cm between the two feet of the compass.
小丽用圆规画一个周长是15.7cm的圆，圆规两脚间应量取的距离是多少cm．
<gadget id="calculator">2 * 3.14</gadget>
<output>6.28</output>

<gadget id="calculator">15.7 / 6.28</gadget>
<output>2.5</output>

<result>2.5</result>