1. Points, lines, planes, segments
Vocabulary
Points, lines, planes, segments

2. Point
Examples: A B
Point C is 1 inch off the face of this screen C

3. Line
Examples: C D E B A

4. Space
Example: (look around…3D view of everything in room)

5. Collinear Points
Example: P N M W X Y Z

6. Plane
Example:

7. Coplanar Points
Example:

8. Postulate Example: Through any two points there is exactly one line.
This is accepted to be true.

9. Segment
Examples: G L H K J

10. Ray
Examples:

11. Parallel
Examples: a b m n

12. Skew
Examples: (Look where floor meets wall in back of room, now look where two walls meet near door.) y
This line is in back z x
This line is in front
The red and green lines will never touch.

13. Congruent
Examples:

14. Theorem
Example:
A2+B2=C2
Can be proven to be true.

15. Conjecture
Form an opinion or supposition about (something) on the basis of incomplete information.
Example: It rained three days in a row, it more than likely will rain again today.

16. Acute .
89⁰
78⁰

17. Right .
90⁰

18. Obtuse .
35⁰
133⁰

19. Theorem
An idea that has been demonstrated as true or is assumed to be true.
Example: Pythagorean triples; A2 + B2 = C2
= 52
= 25
25 = 25
True

20. Congruent
The same shape and size.

21. Complementary Angles
1 + 2 = 90⁰ 1 2 1 2

22. Supplementary Angles
1 + 2 = 180⁰ 1 2 2 1

23. Vertical Angles
1 = 3 AND 2 = 4 2 3 1 4

24. Adjacent Angles .

25. Linear Pair .

26. Segment Bisector
Cuts segment in half c a b d

27. Angle Bisector

28. Perpendicular Bisector.