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Lines and Angles
Term | Definition |
---|---|
Line | Connected points that go forever in 2 directions |
Angle | 2 rays or 2 line segments with a shared vertex |
Parallel | 2 lines that are in the same plane that never intersect. |
Vertical | The angles opposite of each other when 2 lines intersect. They share a vertex and are congruent. |
Line Segment | Connected points that have a distinct beginning and ending point |
Acute | An angle that is between 0 and 90 degrees; not including 90 degrees |
Intersecting | 2 lines that cross at single point |
Complementary | 2 angles whose sum of measure equals 90 degrees |
Ray | Connected points that have a distinct beginning point and continue forever in one direction |
Obtuse | An angle that measures between but does not include 90 and 180 degrees |
Perpendicular | 2 lines that cross at a single point forming 90 degree angles |
Transversal | The line that crosses parallel lines forming 8 angles |
Right | An angle that measures exactly 90 degrees |
Corresponding | Angles that are on the same side of a transversal and in the same location on different parallel lines; they are congruent |
Alternate Interior | Angles that are on opposite sides of the transversal but inside the parallel lines; they are congruent |
Straight | An angle that measures exactly 180 degrees |
Vertex | A distinct point where lines intersect or angles originate |
Supplementary | 2 angles whose sum or measure equals 180 degrees |
Alternate Exterior | Angles that are on opposite sides of the transversal and outside of the parallel lines; they are congruent |
Line Relationship | The way 2 lines perform together, such as parallel, perpendicular, or intersecting |
Angle Relationship | The way 2 angles perform together, such as vertical, adjacent, supplementary, etc. |
Adjacent | 2 angles that are side by side, share a vertex, and share one side |