| A | B |
|---|
| Angle | Formed by 2 rays that have the same endpoint |
| Angle Bisector | A ray that divides an angle into 2 congruent angles |
| area | the number of square units a polygon encloses |
| Collinear Points | Points that lie on the same line |
| Complementary Angles | 2 angles whose measures have a sum of 90 |
| Congruent Angles | Angles that have the same measure |
| Congruent Segments | Segments that have the same length |
| Coplanar | Anything that lies in the same plane |
| Line | Straight path that extends in 2 opposite directions without end |
| Linear Pair | 2 adjacent angles whose noncommon sides are opposite rays |
| Midpoint | a point that divides a segment into 2 congruent pieces |
| Perimeter | The sum of the lengths of the sides of a polygon |
| Plane | A flat surface that extends without end |
| Point | A location in space |
| Polygon | A closed plane figure formed by three or more segments |
| Ray | The part of a line that consists of one endpoint and all of the points of the line on one side of the endpoint |
| Segment | The part of a line that consists of 2 points, called endpoints and all points between them |
| Segment Bisector | a line, segment, ray or plane that intersects a segment at its midpoint |
| Space | the set of all planes |
| Supplementary Angles | 2 angles whose measures have a sum of 180 |
| Vertical Angles | 2 angles whose sides are opposite rays |
| Adjacent Angles | 2 coplanar angles that have a common side and common vertex but no common interior points |
