A square is divided into four rectangles by two line segments. The sum of the perimeters of these four rectangles is 16 decimeters. Find the perimeter of the original square in decimeters.
一个正方形被两条线段分成了四个长方形，这4个长方形的周长和是16分米，求原来正方形的周长是多少分米．
<gadget id="calculator">16 / 2</gadget>
<output>8</output>

<result>8</result>