A 48 cm long iron wire is folded into a square frame, what is the side length of this rectangle in cm? (solution by equation)
用一根48厘米长的铁丝折成一个正方形框架，这个长方形的边长是多少厘米？(用方程解)
<gadget id="calculator">48 / 4</gadget>
<output>12</output>

<result>12</result>