| A | B |
|---|
| Triangle | a polygon with three sides |
| Quadrilateral | a polygon with four sides |
| Pentagon | a polygon with five sides |
| Hexagon | a polygon with six sides |
| Heptagon | a polygon with seven sides |
| Octagon | a polygon with eight sides |
| Nonagon | a polygon with nine sides |
| Decagon | a polygon with ten sides |
| n-gon | a polygon with n number of sides |
| equilateral polygon | a polygon with all sides congruent |
| equiangular polygon | a polygon with all angles congruent |
| regular polygon | a polygon with all sides and angles congruent |
| consecutive angles | two angles that share a side |
| consecutive sides | two sides that share a vertex |
| diagonal | a segment that connects nonconsecutive vertices |
| convex polygon | a polygon in which no segment that connects two vertices can be drawn outside the polygon |
| concave polygon | a polygon in which a segment that connects two vertices can be drawn outside the polygon |
