| A | B |
|---|
| Acute angle | angle that measures less than 90 |
| Adjacent angles | two coplanar angles that share a vertex and a side but do not overlap |
| A circle | contains 360 degrees |
| Two angles are complements of each other if the | sum of their measures equal 90 degrees |
| Linear pair | Two adjacent angles whose non-shared rays form a straight angle |
| The angles that form a linear pair | are supplementary |
| If /_ 1 and /_ 2 form a linear pair, then | m /_ 1 + m /_ 2 = 180 degrees |
| Obtuse angle | angle that measures between 90 and 180 degrees |
| Two lines,segments,or rays are perpendicular if they | intersect to form right angles. |
| If two lines are perpendicular, then they form | congruent adjacent angles. |
| If two lines form congruent adjacent angles, then | the lines are perpendicular. |
| If /_ 1 is congruent to /_ 2 and /_ 1 adjacent to /_ 2, then | the intersecting lines that formed the angles are prependicular |
| Right angle | an angle that measures exactly 90 degrees |
| Straight angle | an angle that measures exactly 180 degrees |
| Two angles are supplements of each other if the | sum of their measures equal 180 |
| Vertical Angles are | non-adjacent, non-overlapping angles formed by two intersection lines. |
