A square is divided into 4 rectangles by 2 line segments. The sum of the perimeters of these 4 rectangles is 18 decimeters. What is the perimeter of the original square?
一个正方形被2条线段分成4个长方形，这4个长方形周长的和是18分米，则原来正方形的周长是多少分米？
<gadget id="calculator">18 / 2</gadget>
<output>9</output>

<result>9</result>