Use a compass to draw a circle with a circumference of 18.84cm. What is the distance between the two feet of the compass?
用圆规画一个周长是18.84cm的圆，圆规两脚之问的距离应取多少．
<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>