If a circle is drawn on a piece of rectangular paper with a length of 9 cm and a width of 6 cm, the distance between the two feet of the compass cannot exceed how many centimeters.
在一张长9厘米，宽6厘米的长方形纸上画一个圆，则圆规两脚间的距离不能超过多少厘米．
<gadget id="calculator">6 / 2</gadget>
<output>3</output>

<result>3</result>