A square flower bed has a perimeter of 51.2 meters, what is its side length in meters? (column equation solution)
一个正方形花坛，周长是51.2米，它的边长是多少米？(列方程解答)
<gadget id="calculator">51.2 / 4</gadget>
<output>12.8</output>

<result>12.8</result>