Cut a piece of rectangular paper with a length of 48 cm and a width of 30 cm into a square of the same size without any residue. What is the maximum length of the side of the square in cm?
把一张长48厘米，宽30厘米的长方形纸截成大小一样的正方形且没有剩余，正方形的边长最大是多少厘米．
<gadget id="calculator">2 * 3</gadget>
<output>6</output>

<result>6</result>