1. are points that lie in the same plane.
Collinear Points
are points on the same line.
Coplanar Points
are points that lie in the same plane.

2. Non-collinear points
are points that do not lie on 1 line.

3. Non-coplanar points
are points that do not lie
On 1 plane.

4. Point A is on line 1.
Point A is in line 1.
Line 1 contains point A.
Line 1 is through point A.

5. The intersection of line 1 and line2 is point A.
Intersection means the elements in both sets.
Is the symbol for intersection.

6. Which is in? Which is thru?L1
Which is thru? L2

7. In? Under? Above? L3 L1 L2

8. Which plane contains Point A ? Point B ? Point C ? Point D ? Line AB ?
Both
Which plane contains Point A ? Point B ? Point C ? Point D ? Line AB ?
Both V H
Both

9. Classroom Ex. P

10. Classroom Ex. P

11. Complete Shapes How many planes are drawn?
Add Lines to complete the diagram. 6
How many planes are drawn?

12. Complete 3-D diagrams 8
Number of Planes = 7
Number of Planes =

13. Name the segment that go through point V.
VRS
VST
VWR
VWT
Name the rest of the
Planes.
RST

14. Complete the pyramid.

15. Alternative Plane Drawings
Note that the intersection
of two planes is a line.
The boundaries of the planes are only in the model.
A real planes goes on for ever.
Therefore, segment AD stretches out to be a line.

16. BCF ABC CDE ABG ADE Name the back plane. Name the left plane.
Name the bottom plane.
CDE
Name the top plane.
ABG
Name the front plane.
ADE

17. Three planes can intersect at a 1 line.

18. Three planes can intersect at a 1 point.

19. H R H L L L, R, H L, R, H Point C is in plane _____
Point D is in plane _____ R
Point E is in plane _____ H
Point F is in plane _____ L
Point G is in plane _____
L, R, H
Point A is in plane _____
L, R, H
Point B is in plane _____

20. True or False X S T #1 O W
True R Y
Intersects plane M at point O.

21. #2 True or False False Plane M intersects at more than 1 point. X S TW R
False Y
Plane M intersects at more than 1 point.

22. True or False X #3 S T O W R
False Y
T, O and R are collinear.

23. True or False X #4 S T O
True W R Y
X, O, and Y are collinear.

24. True or False X #5 S T O
True W R Y
R, O, S, and W are coplanar.

25. True or False X #6 S T O W R
False Y
R, S, T, and X are coplanar.

26. True or False X #7 S T O
True W R Y
R, X, O and Y are coplanar.

27. X #8 S T O No W R Y
Does a plane have edges?

28. X #9 S T O
Yes W R
Yes Y
Can a given point be in 2 lines? Ten lines?

29. #10 Yes Yes Can a given line be in 2 planes? In 10 planes? X S T O W R

30. #11-16 Find the fourth point of the plane. False D G G H A F
A, B, C, ___
E, F, H, ___
D, C, H, ___ H A F
A, D, E, ___
B, E, F, ___
B, G, C, ___

31. Yes Yes Are there any points in line CG besides C and G?
Are there more than 4 points in plane ABCD?
Yes

32. ABCD & DFGH ABFE & DCGH ADHE & BCGF
Name the intersection of plane ABFE and BCGF.
Name two planes that do not intersect.
ABCD & DFGH
ABFE & DCGH
ADHE & BCGF

33. C’est fini.
The End