| A | B |
|---|
| triangle | a 3 sided figure |
| quadrilateral | a 4 sided figure |
| pentagon | a 5 sided figure |
| hexagon | a 6 sided figure |
| heptagon | a 7 sided figure |
| octagon | a 8 sided figure |
| nonagon | a 9 sided figure |
| decagon | a 10 sided figure |
| polygon | a closed figure formed by three or more line segments |
| regular polygon | polygon with all sides congruent |
| parallel lines | two lines that will never touch |
| perpendicular lines | two lines that meet forming 90 degree angles |
| similar polygons | same shape different size |
| angle | made up of 2 rays |
| vertex | the center of an angle |
| acute angles | angle more than 0* and less than 90* |
| obtuse angles | angle more than 90* and less than 180* |
| right angle | angle at 90 degrees |
| supplementary angles | 2 angles whose sum is 180 |
| complementary angles | 2 angles whose sum is 90 |
