Geometry Vocabulary

3. a point, ray, line, segment, or plane that intersects a segment at its midpoint
4. has one dimension; it is usually represented by a straight line with two arrowheads to indicate that it extends without end in two directions
5. angles that have a sum of 180°
8. the absolute value of the difference of the coordinates of the points
11. the real number that corresponds to a point on a line
12. an angle that measures 180°
14. points points that lie on the same line
16. has two dimensions; it is usually represented by a shape that looks like a floor or a wall, it extends without end
17. has no dimension; it is usually represented as a dot
19. the set of points that two or more geometric figures have in common
22. rays that have the same endpoint but go in opposite directions
23. angles that have a sum of 90°
24. an angle measuring between 90° and 180°
25. terms that can be described using known words

1. points that lie on the same plane
2. an angle that measures 90°
6. a rule that is accepted without proof
7. a point that divides, or bisects, a segment into two congruent segments
9. an angle that measure between 0° and 90°
10. adjacent angles whose sum is 180°
13. a word that does not have a formal definition, but there is agreement about what the word means
15. part of a line that consists of a point called an endpoint and all points on the line that extend in one direction
18. line segments that have the same length
20. when three points lie on a line, you can say that one point is between the other two
21. part of a line that consists of two points, called endpoints, and all points on the line that are in between