A piece of iron wire can be folded into a rectangle with a length of 6 meters and a width of 4 meters. If this wire is folded into a square, what is the side length of the square?
一根铁丝可以折成长6米，宽4米的长方形，如果把这根铁丝折成正方形，那么正方形的边长是几米？
<gadget id="calculator">6 + 4</gadget>
<output>10</output>

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

<gadget id="calculator">20 / 4</gadget>
<output>5</output>

<result>5</result>