It depends when the windows are open no, but when they are not, yes.
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Closed
No, take a semicircle, it is a plane figure and is open. Or a parabola is also open and a plane figure.
"Show" is open, "and" is closed. O- is open, -pen is closed. "Closed" is closed.
a closed, flat figure is a polygon. But it is only a polygon when it is not round.
Any closed figure formed by a set of straight linesegments is a polygon. If the segments are curved such as in a circle or oval, the closed figure is not a polygon.