A rope can form a rectangle with a length of 7 meters and a width of 5 meters. If it forms a square, what is the side length of the square?
一根绳子能围成一个长7米，宽5米的长方形，如果围成一个正方形，正方形的边长是多少米？
<gadget id="calculator">7 + 5</gadget>
<output>12</output>

<gadget id="calculator">12 * 2</gadget>
<output>24</output>

<gadget id="calculator">24 / 4</gadget>
<output>6</output>

<result>6</result>