Use an iron wire to form a rectangle with a length of 6 decimeters and a width of 4 decimeters. If this iron wire is used to enclose a square, what is the side length of the square?
用一根铁丝围成一个长6分米、宽4分米的长方形，如果用这根铁丝去围一个正方形，那么这个正方形的边长是多少分米？
<gadget id="calculator">6 + 4</gadget>
<output>10</output>

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

<gadget id="calculator">10 * (1/2)</gadget>
<output>5</output>

<result>5</result>