Geometry Unit 1

4. A line, ray, or segment that is perpendicular to a segment and passes through its midpoint.
6. A location in space with no size or shape.
7. Angles with the same measure.
8. Points that lie on the same plane.
10. A part of a line that begins at an endpoint and extends infinitely in one direction.
11. A flat surface that extends infinitely in all directions.
12. Points that do not lie on the same plane.
13. Two lines that intersect to form right angles (90°).
14. A formula used to find the distance between two points on a coordinate plane.
16. An angle measuring less than 90°.
20. An angle measuring greater than 90° and less than 180°.
21. If point D is in the interior of ∠ABC, then m∠ABD+m∠DBC=m∠ABC
23. Opposite angles formed by two intersecting lines.
24. A line, ray, segment, or plane that intersects a segment at its midpoint.
26. A measurable part of a line with two endpoints.
27. A ray that divides an angle into two congruent angles.
29. A figure formed by two rays that share a common endpoint.

1. Two angles whose measures add to 180°.
2. If points A, B, and C are collinear and B is between A and C, then AB+BC=AC
3. Points that do not lie on the same line.
5. An angle measuring exactly 90°.
9. A formula used to find the midpoint between two points.
13. Two coplanar lines that never intersect.
15. A pair of adjacent angles whose noncommon sides form a straight line.
16. Two angles that share a common vertex and a common side.
17. Two angles whose measures add to 90°.
18. The common endpoint of the rays that form an angle.
19. An angle measuring exactly 180°.
22. A straight path made up of points that extends infinitely in both directions.
25. Segments that have the same length.
28. Points that lie on the same line.