| A | B |
|---|
| reflex angle | an angle that measures between 180 and 360 degrees |
| co-interior angles | angles that lie inside the parallel lines and on the same side of the transversal |
| vertex | the point where the 2 arms of an angle meet |
| acute angle | an angle less than 90 degrees |
| right angle | an angle that measures 90 degrees |
| obtuse angle | an angle that measures between 90 and 180 degrees |
| straight angle | an angle that measures 180 degrees |
| revolution | an angle that measures 360 degrees |
| adjacent angles | angles that have the same vertex and a common arm |
| complementary angles | 2 angles that add up to 90 degrees |
| supplementary angles | 2 angles that add up to 180 degrees |
| transversal | a line that crosses 2 or more other lines |
| corresponding angles | angles that have matching positions relative to the transversal and a parallel line |
| alternate angles | angles that lie inside the parallel lines and on opposite sides of the transversal |
