1. 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: A B C D E

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

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

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 H L J K

10. Ray Examples:

11. Parallel Examples: a b n m

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

13. Congruent Examples:

14. Theorem Example: A 2 +B 2 =C 2 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. 78⁰ 89⁰

17. Right. 90⁰

18. Obtuse. 133⁰ 35⁰

19. Theorem An idea that has been demonstrated as true or is assumed to be true. Example: Pythagorean triples; A 2 + B 2 = C 2 3 2 + 4 2 = 5 2 9 + 16 = 25 25 = 25 True

20. Congruent The same shape and size.

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

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

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

24. Adjacent Angles.

25. Linear Pair.

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

27. Angle Bisector

28. Perpendicular Bisector.