QUADRILATERAL, A polygon that has four sides and four angles, TRIANGLE, A polygon that has 3 sides and 3 angles, POLYGON, is a closed figure where the sides are all line segments, ANGLE, formed by two rays meeting at a common end point, LINES, is made of a set of points which is extended in opposite directions infinitely, OCTAGON, A polygon that has 8 sides, PENTAGON, A polygon that has 5 sides, NONAGON, A polygon that has 9 sides, CONVEX, The lines containing the sides of the polygon do not contain points in its interior., REGULAR, A polygon that is both equilateral and equiangular., NONCONVEX, At least one of its sides is contained in a line, which contains also points in the interior of the polygon., IRREGULAR, A polygon that is neither equilateral nor equiangular., POLY, A Greek word meaning “many”, GON, A Greek word meaning “angle”, DIAGONAL, A segment joining any two nonconsecutive vertices.

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