A closed plane figure with at least 3 sides that are segments
Polygon
No diagonal line with points outside the polygon
Convex Polygon
At least 1 diagonal line with points outside the polygon
Concave Polygon
All sides are Congruent
Equilateral Polygon
All angles are Congruent
Equiangular Polygon
Is both Equilateral and Equiangular
Regular Polygon