| Term | Definition |
|---|
| Line | A series of points that extends in two opposite directions without end. |
| Collinear Points | Points that lie on the same line. |
| Plane | A flat surface that has no thickness. |
| Coplanar | Points and lines in the same plane. |
| Postulate | An accepted statement of fact. |
| Three Non-Collinear Points | The minimum number of points to form exactly one plane. |
| Segment | A part of a line consisting of two endpoints and all points inbetween. |
| Ray | A part of a line with one endpoint and all the points of the line on one side of the endpoint. |
| Opposite Rays | Two rays with the same endpoint forming a line. |
| Skew Lines | Lines that are non-coplanar, not parallel, and do not intersect. |
| Parallel Lines | Coplanar lines that do not intersect. |
| Congruent | Having the same size and shape. |
| Congruent Segments | Segments that have the same length. |
| Midpoint | The point of a segment that divides the segment into two congruent segments. |
| Acute Angle | An angle whose measure is less than 90 degrees. |
| Right Angle | An angle whose measure is 90 degrees. |
| Obtuse Angle | An angle whose measure is between 90 and 180 degrees. |
| Straight Angle | An angle whose measure is 180 degrees. |
| Congruent Angles | Angles whose measures are the same. |
| Vertical Angles | Two angles whose sides are opposite rays. |
| Adjacent Angles | Two coplanar angles with a common side, a common vertex, and no common interior points. |
| Complementary Angles | Two angles whose sum is 90 degrees. |
| Supplementary Angles | Two angles whose sum is 180 degrees. |
| Perimeter | The distance around an area. |
| Circumference | The distance around a circle. |
| Area | The number of square units an area occupies. |
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