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 Related Terms
 Convex:  If, when you join any two points inside a figure, the resulting line segment also lies inside the figure, then the figure is convex.
Polygon: A closed figure formed by three or more line segments.
Angle: Region between two rays or the amount of rotation about a fixed point.
Interior Angle: An interior angle of a polygon is formed by two adjacent sides. Also, when a third line (a transversal) crosses two other lines, the angles formed in between the other two lines are called interior angles. (see alternate interior angles)
Concave: If, when you join any two points inside a figure, the resulting line segment goes outside the figure, then the figure is concave. Also called nonconvex.