Unit 1 Geometry Vocabulary

2. An angle with a measure of 90°.
7. Two angles with measures that add up to 90°.
10. A line or ray that divides an angle into two equal parts.
11. A point is a location with no size or shape.
13. Adjacent angles that are supplementary.
16. If two segments have the same length, then they are congruent.
17. The formula used to find the difference between two points on a coordinate plane.
18. The common endpoint of an angle.
21. An angle with a measure of less than 90°.
24. Points that do not lie on the same plane.
25. The intersection of two rays at an endpoint.
26. Two angles that have the same measure are congruent.
27. Two angles with measures that add up to 180°.
28. Points that lie on the same line.
29. A segment, line, or plane that intersects a segment at its midpoint.

1. Two lines that never intersect.
3. Two angles that share a common side and vertex.
4. The formula used to find the midpoint between two endpoints.
5. A line that extends indefinitely in one direction.
6. If A, B, and C are collinear points and B is between A and C, then AB + BC = AC.
8. An angle with a measure of 180°.
9. Two angles directly across from each other on intersecting lines.
12. Two lines that intersect at a 90° angle (right angle).
13. A line is made up of points with no thickness or width.
14. Angle An angle with a measure of more than 90°.
15. A line, segment, or ray perpendicular to a segment at its midpoint.
19. Points that lie on the same plane.
20. A plane is a flat surface made up of points and extends indefinitely in all directions.
21. If <ABD and <DBC are adjacent, then <ABD + <DBC = <ABC.
22. A measurable part of a line consisting of two endpoints.
23. Points that do not lie on the same line.