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you can describe it by its angles, or sides
Stop Sign, box of cereal.
A polygon is a plane closed shape that is bounded by straight lines. A figure that is not a polygon is one the does not satisfy all three requirements.If the boundaries of the shape move in three (or more) dimensions then it cannot be a polygon. For example, consider a die, ABCDEFGH where the square EFGH is directly under ABCD. Then ABCGHDA is a closed figure, bounded by straight lines but it is not a plane figure.If ABCD is a square, then ABC is not a polygon because it is not closed.A circle, ellipse, semicircle, a squiggle are not polygons because they are bounded by sides that are no all straight.
Polygon with four sides identical in length, four angles, all of which are 90 degrees.
Nonagon - A polygon with nine sides. Negation - Finding the negative of a statemen. "p" to "~p"