Geometry Vocabulary

2. angle whose measure is between 0 degrees and 90 degrees.
4. points that do not lie on the same plane.
5. two angles whose sum is 90 degrees.
6. a system of reasoning that uses facts, rules,definitions, or properties to reach logical conclusions.
8. the non-adjacent angles formed by two intersecting lines.
10. is the part of a line that contains an endpoint and all points extending in the other direction.
11. two lines are parallel if they are coplanar and do not intersect.
14. two angles whose sum is 180 degrees.
16. line, ray segment, or plane that divides a segment into two congruent segments.
17. a statement or conjecture that can be proven true by given, definitions, postulates, or already proven theorems.
20. segments that have the same length.
21. two lines that intersect to form right angles.
25. reasoning that uses a number of specific examples to arrive at a plausible prediction.
27. a logical argument in which each statement you make is supported by a statement that is accepted as true.
28. two coplanar angles with a common vertex and a common side between them
30. points points that do not lie on the same line.
31. points that lie on the same plane.

1. an educated guess based on known information.
3. angles that have the same measure.
7. set of all points.
9. points points that lie on the same line.
11. set of points that has infinite length and width but no height. We name a plane with a capital letter.
12. set of points which has infinite length but no width or height. A line is named by a lower case letter or by any two points on the line.
13. a statement that describes a fundamental relationship between basic terms of geometry. Postulates are accepted as true without proof.
15. ray that divides an angle into two congruent adjacent angles.
18. a point that divides the segment into two congruent segments.
19. has no size; length, width, or height. It is represented by a dot and named by a capital letter.
22. part of a line that consists of two points called endpoints and all points between them.
23. angle whose measure is 90 degrees.
24. angle whose measure is greater than 90 degrees but less than 180 degrees.
26. angle whose measure is 180 degrees.
29. branch of mathematics that deals with points, lines, planes and solids and examines their properties.