A rectangular iron wire, 8 meters long and 4 meters wide, is re-enclosed into a square, what is the side length in meters?
一条长方形铁丝，长8米，宽4米，重新围成正方形，边长是多少米？
<gadget id="calculator">8 + 4</gadget>
<output>12</output>

<gadget id="calculator">12 * 2</gadget>
<output>24</output>

<gadget id="calculator">24 / 4</gadget>
<output>6</output>

<result>6</result>