| A | B |
|---|
| vertical | two angles whose sides form two pairs of opposite rays. They are congruent |
| vertex | the place where the two sides of an angle meet |
| supplementary angles | two angles whose measures have the sum of 180 degrees |
| straight angle | an angle whose measures is 180 degrees. It appears as a straight line. |
| sides | the rays of a given angle, whose endpoints are the vertex of the angle |
| right angle | an angle with a measurement of 90 degrees |
| obtuse angle | an angle with a measure greater than 90 degrees |
| acute angle | an angle with a measure is less than 90 degres |
| angle bisector | a ray that divides an angle into two angle that are congruent |
| adjacent angle | two angle that share common vertex and sides, but have no common interior points |
| congruent angle | angles that have the same measure |
| complementary angles | two angle whose measures have the sum of 90 degrees |
| linear pair | two adjacent angle whose uncommon sides are opposite rays. The sum of their measure is 180 degrees |
| measure of an angle | the distance between a point on one ray of an angle and a point on the other ray of the same angle. Given in degrees |
