| A | B |
|---|
| acute angle | one whose degree measure is less than 90 |
| adjacent angles | two angles in the same plane have a common side and a common vertex, but no interior points in common |
| angle | Consists of two noncollinear rays with a common endpoint |
| angle bisector | A ray, QS, is this to an angle PQR if S is in the interior of the angle and angle PQS is about equal or equal to angle RQS |
| collinear points | Points that lie on the same line |
| complementary angles | Two angles are this if the sum of their degree measure is ninety |
| congruent angles | Two angles are this if they have the same measurement |
| congruent segments | Two segments are this if they have exactly the same length |
| coplaner points | Points that lie on the same plane |
| linear pair | Two angles that are adjacent with with their noncommon sides being opposite rays |
| noncollinear points | Points that do not lie on the same line |
| noncoplaner points | points that do not lie on the same plane |
| obtuse angle | An angle with a degree measure greater than ninety |
| perpendicular lines | Lines that intersect to form a right angle |
| right angle | An angle whose degree measure is ninety |
| segment | A part of ta line that consists of two points called endpoints, and all the points between them |
| segment bisector | A segment, line, or plane that intersects a segment at its midpoint |
| supplementary angles | When the sum of the degree measures of two angles is 180 |
| vertical angles | Two nonadjacent angles fromed by two intersecting lines |
