1. 1.2 Points, Lines and Planes
Understanding undefined terms that are general understood in geometry

2. Undefined terms which are used in everyday geometry
Point- A no dimension object, a Dot
Show by a capital letter A, B, or X
A Line- a set of points in one dimension. A line goes on forever.
A or or line AB B

3. A Plane- a 2 dimension set of points, most think of this as flat surface that goes on forever. This is plane ZXY or just M
X . Y
Z M

4. Points on line or plane Collinear points are points on the same line
Coplanar points are points on the same plane

5. Line segment or segment
Parts of a line with endpoints
Written as
R G

6. A Ray is line with one endpoint called the Initial Point
C K Written as

7. Opposite Rays
Rays with the same Initial point, but go in opposite directions. The 2 rays here are
And
X C K

8. Intersect where shapes cross. Line AB and ZY
A Y x
z B

9. Homework
Pages 13-16
# 9,12,15,18,21,24,27,30,33,36,39,42
# 44 – 51, 56 – 66 even
# 68-72,