| Term | Definition |
|---|
| angle | two rays that share a common endpoint |
| degree | unit of measurement for angles |
| protractor | a tool used to measure angles |
| vertex | a common endpoint for two rays or sides |
| ray | part of a line that has one endpoint and extends to infinity in the other direction |
| right angle | a 90 degree angle |
| acute angle | an angle measuring less than 90 degrees |
| obtuse angle | an angle measuring more than 90 degrees and less than 180 degrees |
| straight angle | an angle measuring exactly 180 degrees |
| reflex angle | an angle greater than 180 degrees |
| vertical angles | two pairs of opposite angles that form when two lines intersect |
| congruent angles | angles with the same measurement |
| supplementary angles | two angles whose sum is 180 degrees |
| complementary angles | two angles whose sum is 90 degrees |
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