| A | B |
|---|
| Linear Pair Property | If two angles form a linear pair, then they are supplementary. |
| Segment Congruence Postulate | If two segments have the same length, then they are congruent. |
| Segment Congruence Postulate | If two segments are congruent, then they have the same length. |
| Angle Congruence Postulate | If two angles have the same measure, then they are congruent |
| Angle Congruence Postulate | If two angles are congruent, then they have the same measure |
| Angle Addition Postulate | If point D is in the interior of |
| Segment | A part of a line that begins at one point and ends at another |
| Ray | A part of a line that starts at a point and extends indefinitely in one direction. |
| Angle | A figure formed by two rays with a common endpoint. |
| Vertex of an angle | Common endpoint of an angle |
| Sides of an angle | The rays of an angle |
| The intersection of two lines | A point |
| The intersection of two planes | A line |
| Through any two points... | There is exactly one line |
| Through any three noncollinear points... | There is exactly one plane |
| Segment Addition Postulate | If point R is between P and Q on a line, then PR+RQ=PQ |
| Complementary Angles | Two angles whose measures have a sum of 90 degrees |
| Supplementary Angles | Two angles whose measures have a sum of 180 degrees |
| Right Angle | An angle whose measure is 90 degrees |
| Acute Angle | An angle whose measure is less than 90 degrees |
| Obtuse Angle | An angle whos measure is greater than 90 degrees and less than 180 degrees |
| Perpendicular lines | Two lines that intersect to form a right angle |
| Parallel lines | Two coplanar lines that do not intersecgt |
| Segment Bisector | A line that divides a segment into two congruent parts |
| Midpoint of a segment | The point where a bisector intersects a segment |
| Perpendicular Bisector | A bisector that is perpendicular to a segment |
| Angle Bisector | A line or ray that divides an angle into two congruent angles |
