| Term | Definition |
|---|
| complementary angles | 2 angles that add to 90°. |
| supplementary angles | 2 angles that add to 180º. |
| linear pair | 2 angles that are adjacent and add to 180º. |
| vertical angles | 2 angles formed opposite of each other when two lines intersect. |
| angle bisector | A ray that divides an angle into two conguent angles. |
| parallel lines | 2 lines that never intersect. |
| transversal | A line that intersects two or more other lines. |
| alternate interior angles | Angles located on the opposite sides of the tranversal and in the inside of the other 2 line it intersects. |
| alternate exterior an gles | Angles located on opposite sides of the transversal and on the outside of the other 2 lines it intersects. |
| same-side interior angles | Angles located on the same side of the transversal and in the inside of the other 2 lines it intersects. |
| corresponding angles | 2 angles located on the same side of the transversal and in the same corresponding position. |
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