| Term | Definition |
|---|
| undefined terms | have no formal definitions |
| point | has no dimension, represented by a dot |
| line | has no dimension, represented with 2 arrowheads, but it extends w/o end. Through any 2 pts, there is exactly one. You can use any 2 pts. on a line to name it. |
| plane | 2 dimensions, represented by a shape that looks like a floor or wall, but extends w/o end. Through any 3 pts not on the same line, there is exactly one. You can use 3 pts that are not all on the same line to name it. |
| collinear points | points that lie on the same line |
| coplanar points | points that lie in the same plane |
| congruent segments | line segments that have the same length |
| midpoint | the point that divides the segment in 2 congruent segments |
| segment bisector | a point, ray, line, line segment, or plane that intersects the segment at its midpoint |
| angle | two different rays with the same endpoint |
| vertex | the endpoint of an angle |
| angle bisector | a ray that divides and angle into 2 angles that are congruent |
| complementary angles | 2 angles which have a sum of 180 degrees |
| supplementary angles | 2 angles which have a sum of 90 degrees |
| adjacent angles | 2 angles that share a common ray |
| linear pair | adjacent and supplementary angles |
| vertical angles | the sides of the angles form 2 pair of opposite rays that are always equal |
Combine with other sets
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