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Non-convex is also referred to as concave. Convex and non-convex both define the types of curvature. Convex defines the curvature that extends outwards or bulges out. On the other hand, non-convex defines a curvature that extends or bends inward. Thus, the extension of the curve is used to differentiate between the two forms. Convex and non-convex are often used as adjectives to define the entities associated with the shape or curve defined by them.
The sum of the interior angles of any nonself-intersecting polygon with n sides is equal to (n â 2)180Â°. A polygon is said to be convex (see Figure l,a) if none of the lines determined by its sides cuts the polygon into two parts. A convex polygon can also be characterized by the property that a line segment connecting any two points of the plane lying within the polygon does not cross the polygon.