| A | B |
|---|
| polygon | closed figure, with 3 or more sides |
| diagonal | line segment that connects 2 nonconsecutive vertices |
| convex | no diagonal is outside the polygon |
| concave | at least one diagonal is outside polygon. |
| congruent | same shape and same size |
| perimeter | sum of the lengths of the sides, distance around the object |
| triangle | 3 sided figure |
| quadralateral | 4 sided figure |
| pentagon | 5 sided figure |
| hexagon | 6 sided figure |
| heptagon | 7 sided figure |
| octagon | 8 sided figure |
| nonagon | 9 sided figure |
| decagon | 10 sided figure |
| undecagon | 11 sided figure |
| dodecagon | 12 sided figure |
| n-gon | n sided figure |
| equilateral polygon | a polygon with all sides equal in length |
| equangular polygon | a polygon with all angles equal in measure |
| regular polygon | a polygon with all angles and all sides equal. |
