A rectangular wire frame with a length of 4 meters and a width of 2 meters is straightened to form a square. What is the side length of this square?
把一根长4米，宽2米的长方形的铁丝框拉直，刚好围成一个正方形，这个正方形的边长是多少米？
<gadget id="calculator">4 + 2</gadget>
<output>6</output>

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

<gadget id="calculator">6 * (1/2)</gadget>
<output>3</output>

<result>3</result>