A piece of iron wire can form a rectangle with a length of 7 cm and a width of 5 cm. If it is used to form a square, what is the side length of the square?
一条铁丝可以围成一个长7厘米，宽5厘米的长方形，如果用它围成一个正方形，正方形的边长是几厘米？
<gadget id="calculator">7 + 5</gadget>
<output>12</output>

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

<gadget id="calculator">12 * (1/2)</gadget>
<output>6</output>

<result>6</result>