Geometry Vocabulary (Chapter 1)

2. A statement that is accepted as true without proof.
6. A transformation that changes the position of a figure without changing the size of shape.
9. A common measurement unit for circular arcs
10. Lines that lie in the same plane but do not intersect.
11. A statement that can be written in the form "If p, then q" where p is the hypothesis and q is the conclusion.
13. A specific location. It has no dimension and is represented by a dot.
14. A line, ray, or other figure that passes through the midpoint of a segment.
17. An example that shows a conjecture to be false.
19. The process of using logic to prove whether all cases are true.
20. A statement that you can prove is true using a series of logical steps.
21. segment, A portion of a line consisting of two points and all points between them.
22. A connected straight path. It has no thickness and it continues forever in both directions.
25. a figure formed by two rays with the same endpoint.
26. A flat surface. It has no thickness and it extends forever in all directions.
27. A pair of adjacent angles whose non-common sides are opposite rays.

1. A function that changes the position, shape, and/or size of a figure.
3. Points that lie in the same plane
4. Common endpoint of an angle
5. A statement that is believed to be true.
7. A ray that divides an angle into two angles that both have the same measure.
8. Two points at the end and beginning of a line segment.
12. The process of reasoning that a rule or statement may be true by looking at specific cases.
15. A portion of a line that starts at a point (the endpoint) and continues forever in one direction.
16. A figure that is used as the input of a transformation.
18. Points that lie on the same line.
23. The output of a preimage.
24. A point that divides the segment into two segments that have the same length.