A plane figure bounded by straight lines is called a rectilinear figure. A closed figure made up of 3 or more sides is called a polygon.
If the measure of each interior angle of a polygon is less than 1800, then it is called a convex polygon.
If the measure of at least one interior angle of a polygon is more than 1800, then it is a concave polygon.
Rectilinear Figures PDF
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