1. Pts, Lines & Planes OBJ: To ID & model pts, lines & planes
To ID coplanar pts & intersecting lines & planes

2. Definitions Plane: has a length and a width
named by 3 non-collinear pts or a capital script letter A C B R
To name this plane, it would be plane ABC or plane R

3. Definitions Line: just has a length.
Can be named by 2 letters or an italics letter. A B l
So we can say this is line AB or line l
Segment AB has A and B as endpts and is notated by AB

4. Definitions Points: just visual without length or width. AKA- dot
All geometric figures consist of pts.
Space: is a boundless 3-dimensional set of all pts
Collinear: same line
Coplanar: same plane

5. Example List all the possible names for the plane or line.D C B A
A.) Draw the picture
B.) Are pts E,F and C collinear?
C.) Are pts A,C,D and E coplanar?
D.) How many planes are in the picture?
E.) Name a pt that is not collinear to F & C
F.) Name a pt that is not in plane N
G.) What is the intersection of plane N and plane ADE?
B.) yes
C.) no
D.) 5
E.) A, B or D
F.) E
G.) line AD

6. Example
Draw the figure that shows that line m contains pt P. P m

7. Your Turn: G can be any where, just not on either line
Suppose 4 pts are in a coordinate plane, A(3,-4), B(-2,3), C(4,4) and D(0,-5). Draw and label a figure showing line AB, line CD intersecting at pt F, and a pt G that is coplanar with pts A, B, C, D, and F, but not contained in either line.
G can be any where, just not on either line A C B D F G

8. Put this in your agenda
Pg 16
, 35, 36, 40,
54, 56
Homework