A piece of iron wire can form a rectangle with a length of 6 decimeters and a width of 2 decimeters. If this wire is used to form a square, what is the side length of the square?
一根铁丝能围成一个长6分米，宽2分米的长方形，如果用这根铁丝围成正方形，正方形的边长是多少？
<gadget id="calculator">6 + 2</gadget>
<output>8</output>

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

<gadget id="calculator">8 * (1/2)</gadget>
<output>4</output>

<result>4</result>