A rope encloses a square, and this rope encloses a circle. It is known that the radius of the circle is 2.28 meters less than the side length of the square. How long is the rope?
一根绳子围成一个正方形，再用这根绳子围成一个圆，已知圆的半径比正方形的边长少2.28米，这根绳子长几米？
<gadget id="calculator">3.14 * 4 * 2</gadget>
<output>25.12</output>

<result>25.12</result>