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1. point: a location that has neither shape nor size
2. line: made up of points and has no thickness or width
3. plane: a flat surface made up of points that extends infinitely in 4 directions
4. collinear: points that lie on the same line
5. coplanar: points that lie in the same plane
6. point:
7. line:
8. plane:
9. intersection of two or more geometric figures: the set of points that they have in common
10. the intersection of two lines: a point
11. the intersection of two planes: a line
12. space: a boundless, three-dimensional set of all points
13. line segment: a measurable portion of a line, with two endpoints
14. congruent segments: line segments that have the same measure
15. congruent: having the same size and shape
16. constructions: drawings of geometric figures created without the benefit of measuring tools, generally using only a pencil, straightedge, and
compass
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, 17. the distance between two points on a number line:
18. the distance between two points on the coordinate plane:
19. midpoint of a line segment: the point halfway between the endpoints of the segment
20. formula for midpoint of a line segment:
21. segment bisector: any segment, line or plane that intersects a segment at its midpoint
22. ray: a part of a line, having one endpoint and extending indefinitely in one direction
23. ray:
24. opposite rays: two collinear rays sharing a common endpoint
25. angle: two noncollinear rays that have a common endpoint
26. sides of an angle: the two noncollinear rays that make up an angle
27. vertex of an angle: the common endpoint of the two rays of an angle
28. degrees: the unit of measure for angles
29. right angle: an angle that measures 90 degrees
30. acute angle: an angle that measures between 0 and 90 degrees
31. obtuse angle: an angle that measures between 90 and 180 degrees
32. congruent angles: two angles that have the same measure
33. angle bisector: a ray that divides an angle into two congruent angles
34. adjacent angles: two angles that lie in the same plane and have a common vertex and a common side, but no common interior points
35. linear pair: a pair of adjacent angles with noncommon sides that are opposite rays
36. vertical angles: two nonadjacent angles formed by two intersecting lines
37. vertical angles are....: congruent
38. complementary angles: two angles with measures that have a sum of 90 degrees
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