Draw a circle with a circumference of 21.98 cm. What is the distance between the two feet of the compass in cm?
画一个周长是21.98厘米的圆，圆规两脚间的距离是多少厘米．
<gadget id="calculator">21.98 / 3.14 / 2</gadget>
<output>3.5</output>

<result>3.5</result>