To draw the largest circle in a rectangle whose length is 6 cm and width is 4 cm, what is the distance between the two feet of the compass in cm?
要在长是6厘米，宽是4厘米的长方形里画一个最大的圆，圆规两脚间的距离应是多少厘米厘米．
<gadget id="calculator">4 / 2</gadget>
<output>2</output>

<result>2</result>