Unit 1-3 Vocabulary

2. – Two adjacent angles that form a straight line (sum 180°).
4. - two angles that add up to 90 degrees
5. – A slide; moves a figure without turning or flipping it.
7. - two angles that add up to 180 degrees
12. Interior – Angles on the same side of a transversal, inside the parallel lines; they add to 180°.
15. – Opposite angles formed by intersecting lines; they are congruent.
18. – Lines that meet to form right angles.
19. Exterior – Angles on the same side of a transversal, outside the parallel lines; they add to 180°.

1. – A turn around a fixed point.
3. Interior – Angles on opposite sides of a transversal, inside the parallel lines.
4. – Angles in the same relative position when a transversal crosses parallel lines.
6. Exterior – Angles on opposite sides of a transversal, outside the parallel lines.
8. – A line that crosses two or more other lines.
9. – A flip; produces a mirror image over a line.
10. – Lines that never meet and stay the same distance apart.
11. – The point exactly in the middle of a segment.
13. – The length between two points.
14. – The rule that the three angles of a triangle add up to 180°.
16. / Down (you can mix them up as clues):
17. – A measure of how steep a line is (rise over run).