Draw a circle with a circumference of 18.84 cm, what is the distance in cm between the two feet of the compass.
画一个周长是18.84cm的圆，圆规两脚之间的距离是多少cm．
<gadget id="calculator">2 * 3.14</gadget>
<output>6.28</output>

<gadget id="calculator">18.84 / 6.28</gadget>
<output>3</output>

<result>3</result>