If a rope is 2.5 meters long and forms a square, what is the side length of the square?
一条绳子长2.5米，把它围成一个正方形，则这个正方形的边长是多少米．
<gadget id="calculator">2.5 / 4</gadget>
<output>0.625</output>

<result>0.625</result>