Two iron wires of the same length, one encloses a rectangle with a length of 12 cm and a width of 8 cm; the other encloses a square, what is the side length of this square in cm?
两根同样长的铁丝，一根围成长是12厘米、宽是8厘米的长方形；另外一根围成一个正方形，这个正方形的边长是多少厘米？
<gadget id="calculator">12 + 8</gadget>
<output>20</output>

<gadget id="calculator">2 / 4</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">20 * (1/2)</gadget>
<output>10</output>

<result>10</result>