| A | B |
|---|
| acute angle | angle that is less than 90 degrees |
| obtuse angle | angle between 90 and 180 degrees |
| straight angle | exactly 180 degrees |
| right angle | exactly 90 degrees |
| protractor | tool used for measuring angles |
| complimentary angles | 2 or more angles equal to 90 degrees |
| supplementary angles | 2 or more angles equal to 180 degrees |
| 140 degrees | the supplement of 40 degrees |
| 25 degrees | the compliment of 65 |
| vertex | the point where two rays meet |
