In a rectangle with a length of 8 cm and a width of 7 cm, draw two circles of the same size, what is the longest diameter of the circles in cm?
在一个长8厘米，宽7厘米的长方形内，画两个同样大的圆，则圆的直径最长是多少厘米．
<gadget id="calculator">8 / 2</gadget>
<output>4</output>

<result>4</result>