Draw a straight line segment.
From one of its ends, draw another straight line segment.
From the end of this straight line, draw another straight line segment which does not touch any of the existing lines.
Repeat the same 5 more times.
From the end of this last line, draw a straight line to the start of the first line.
You may need to tweak some of the intermediate lines so that the last line does not intersect an existing line.
That is it! A plane area enclosed by 9 straight lines = a 9-sided polygon.
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