Geometry

2. 8-sided polygon
3. points all in one plane
7. two angles in a plane that have a common vertex and a common side but no common interior points
9. angle with measure between 90 and 180
10. angle with the measure 180
11. set of points in a plane that are a given distance from a given point in a plane
12. set of all points
14. a statement that is accepted without proof
15. angle with measure between 0 and 90
17. a statement that can be proved
18. points all in one line
19. angle with the measurement of 90
20. a quadrilateral with four right angles and four congruent sides

1. a quadrilateral with four right angles
4. segment whose endpoints lie on a circle
5. figure formed by two rays that have the same endpoint
6. example used to prove that an if-then statement is false
8. chord that contains the center of a circle
13. plane figure formed by coplanar segments such that (1) each segment intersects exactly two other segments, one at each endpoint; and (2) no two segments with a common endpoint are colinear
16. quadrilateral with four congruent sides