Geometry Module 1 Vocabulary

4. divide into two congruent parts.
6. points and lines that lie on the same plane.
7. a closed plane figure formed by three or more line segments such that each segment intersects exactly two other segments only at their endpoints.
9. a point at the end of a segment or the starting point of a ray.
11. is a part of a line that starts at an endpoint and extends forever in one direction.
12. a geometric object that does no meet the definition of a polygon.
14. a polygon where all the sides and angles are congruent.
16. names a straight path of points in a plane.
18. concepts in geometry that are so basic that it is impossible to write a definition that does not refer to the term being defined.
20. two angles in the same plane with a common vertex and a common side, but no common interior points.
21. the common endpoint of the two rays that form the angle.

1. a statement that is accepted as true without proof.
2. the measure of the length of the shortest distance between two points.
3. a point that bisects the segment into two congruent segments.
5. points that lie on the same line.
6. two segments that have the same length.
8. where n is the number of sides in the figure.
10. names a location.
13. is a part of a line consisting of two endpoints and all points between them.
15. is a flat surface.
17. of a geometric surface is the surface contained within the boundaries of two-dimensional object.
19. formed by two line segments or rays that share the same endpoint.