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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.
A polygon can be defined as a closed plane figure (a two dimensional shape) that consists of three or more line segments. Polygons can be divided into many types. One such type is based on the internal angles. A convex polygon is the one in which none of the angles point inwards. In other words, it has no internal angle that is greater than 180 degrees. A polygon with any of the internal angles greater than 180 degrees is known as a concave polygon.