Draw a circle with a circumference of 18.84 cm. How many centimeters should the two legs of the compass be apart?
画一个周长为18.84厘米的圆，圆规的两脚应叉开多少厘米．
<gadget id="calculator">18.84 / 3.14 / 2</gadget>
<output>3</output>

<result>3</result>