1. Points, Lines and Planes
Thanks Mrs. Nicole Takayama
Smyrna High School

2. Point Has no dimension Represented by a small dot
Named by a capital print letter
No symbol

3. Example Say Write
“ Point A” A A

4. Line Has one dimension Extends without end in two directions
Represented by a line with 2 arrowheads
Named by 2 points or a lowercase, script letter
Symbol

5. Example Say Write “line AB” “line BA” “line BC” “line CB” “line AC”\
“line CA”
“line d” AB BA BC CB AC CA d d C B A

6. Collinear Points
Points on the same line

7. Example Say Write A, B, and C are collinear. They are all on d d
“points A, B, and C are collinear. They are all on line d.” C B A

8. Noncollinear Points
Points not on the same line

9. Example Say Write d
“points A, B, and C are noncollinear. Points A and B are on line d, but point C is not.”
A, B, and C are noncollinear. A & B are on d, but C is not. C B A

10. Plane Has 2 dimensions Flat surface that extends without end
Represented by a parallelogram
Named by three noncollinear points or capital, script letter
No symbol

11. Example Say Write
“plane ABC”
“plane P”
ABC P P C B A

12. Coplanar On the same plane Lines can be coplanar
Points can be coplanar

13. Example Say Write
“Points A, B, and C are coplanar. They lie on plane P.”
A, B, & C are coplanar, they lie on P P C B A

14. Noncoplanar
NOT on the same plane

15. Example Say Write
“Lines AD and BC are noncoplanar. Line BC lies on plane ABC, while line AD passes through it.
BC and AD are noncoplanar P C B A D

16. Segment
Part of a line
Has a beginning and an end (both are called endpoints)
Named by the two endpoints
Symbol

17. Example Say Write
“segment AC”
“segment CA” AC CA C A

18. Ray
Part of a line
Has a beginning (called an endpoint) and continues forever in ONE direction
Named by the endpoint and one other point to show direction
Symbol

19. Example Say Write
“ray AB”
“ray AC” AB AC C B A

20. Homework Complete the following worksheets
Tutor side Problems 1 – 10 skip #8
Points, Lines and Segments side 1-15