A piece of iron wire can form a rectangle with a length of 12 cm and a width of 8 cm. If this wire is formed into a square, what is the side length of the square?
根铁丝可围成一个长12厘米，宽8厘米的长方形，如果把这根铁丝围成正方形，这个正方形的边长是多少厘米？
<gadget id="calculator">12 + 8</gadget>
<output>20</output>

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

<gadget id="calculator">20 * (1/2)</gadget>
<output>10</output>

<result>10</result>