Two wires of the same length are folded into a rectangle, the length of the rectangle is 5 cm, and the length of the rectangle is 2 cm longer than the width. If the other piece is folded into a square, what is the length of the side of the square?
两根同样长的铁丝，一根折成长方形，长方形的长是5厘米，比宽长2厘米．另一根折成正方形，折成正方形的边长是多少厘米．
<gadget id="calculator">5 - 2</gadget>
<output>3</output>

<gadget id="calculator">5 + 3</gadget>
<output>8</output>

<gadget id="calculator">8 * 2</gadget>
<output>16</output>

<gadget id="calculator">16 / 4</gadget>
<output>4</output>

<result>4</result>