Unit 1 Geometry Vocab

3. Any line, ray or segment that intersects the segment at its midpoint, dividing it into two congruent halves.
5. A portion of a line with one endpoint that extends infinitely in one direction.
7. An angle with a measure between 0° and 90°.
8. The amount of rotation needed to rotate one of the rays about their shared point so that it lies on top of the other ray.
11. A line, ray or segment that intersects another segment at both its midpoint and a right angle.
12. Angles whose measures have a sum of 180°.
14. An angle with a measure of exactly 180°.
15. Two angles with a common vertex and a common side but no common interior points.
18. Lines that intersect at right/90° angles.
19. A point on a line segment that divides the segment in two congruent halves.
20. A point on a line segment that divides the segment in two congruent halves.
22. A portion of a line consisting of two endpoints and all the points in between.
23. A straight one-dimensional figure that extends infinitely in both directions.

1. The opposite angles created when two lines intersect. They are congruent.
2. Two angles that are adjacent and their noncommon sides are opposite rays. They are also supplementary.
4. An angle with a measure of 90°.
6. Angles that have the same measure.
9. An angle with a measure between 90° and 180°.
10. Lines that never intersect.
13. A point on a line segment that divides the segment in two congruent halves.
16. Angles whose measures have a sum of 90°.
17. Points that lie on the same line.
21. A point on a line segment that divides the segment in two congruent halves.