Draw the largest circle in a rectangle with a length of 8 cm and a width of 7 cm. What is the distance between the two feet of the compass in cm?
在一个长8厘米，宽7厘米的长方形里面画一个最大的圆，圆规两脚之间的距离是多少厘米．
<gadget id="calculator">7 / 2</gadget>
<output>7/2 = around 3.5</output>

<result>7/2 = around 3.5</result>