Geometry Vocabulary

2. A statement accepted without proof as a starting point for reasoning in geometry.
4. A line segment that connects the center of a circle to any point on the circle.
10. A part of the circumference of a circle.
12. A polygon with four sides and four angles.
14. The branch of mathematics that deals with the study of shapes, sizes, and properties of space.
15. A mathematical statement that has been proven to be true.
16. The common endpoint of two rays that form an angle.
18. A set of points in a plane that are equidistant from a fixed center point.
19. A method of logical thinking that uses general principles or theorems to make specific conclusions.
20. A portion of a line with two endpoints.
23. A location in space, represented by a dot, and has no size or dimension.
24. Two figures that have the same size and shape.
26. An example that proves a statement false by showing that it does not hold in all cases.
28. A statement that can be easily deduced from a theorem.
29. A method of logical thinking that uses specific observations to make general conclusions.

1. The "then" part of a conditional statement in a theorem.
3. Lines that never intersect and are always at the same distance from each other.
5. A line segment with endpoints on a circle.
6. The "if" part of a conditional statement in a theorem.
7. Curves that cross each other at one point.
8. A logical sequence of statements and reasons used to demonstrate the truth of a theorem.
9. A straight path that extends infinitely in both directions, made up of an infinite number of points.
11. Curves that intersect at a right angle (90 degrees).
13. A figure formed by two rays sharing a common endpoint called the vertex.
15. A polygon with three sides and three angles.
17. A part of a line that starts at an endpoint and extends infinitely in one direction.
21. A closed shape with straight sides.
22. Two figures that have the same shape but not necessarily the same size.
25. A line segment that passes through the center of a circle and has endpoints on the circle.
27. A line or line segment that touches a circle at exactly one point.