In a rectangle with a length of 6 cm and a width of 4 cm, draw the largest circle, what is the radius of the circle in cm o.
在一个长为6厘米、宽为4厘米的长方形中，画一个最大的圆，圆的半径是多少厘米o．
<gadget id="calculator">4 / 2</gadget>
<output>2</output>

<result>2</result>