# 1-2 Points, Lines, and Planes

```Notes #1 (1.1 &amp; 1.2)
1-1 Points, Lines, and Planes
1-2 Linear Measure and Precision
Standard 1.0: Students demonstrate
understanding by identifying and giving
examples of undefined terms.
Objective:
Identify and model points, lines, and planes
Identify collinear and coplanar points and
intersecting lines and planes in space.
Identify segments and compute with measures
Definitions
Undefined Terms: are terms that can only be
explained using examples and descriptions.

Point: has no size. Think “a dot”

Space: is the set of all points

Line: a series of points that extends without end
in two directions.
t
AB
B
A
Collinear points
Points that
lay on a line
Non-collinear points
Points that
don’t lay on
a line.

Plane: is a flat surface that is two
dimensional, it also extends without end.
P
A•
plane P

B•
C•
plane ABC
Coplanar: Points and lines in the same
plane
•H
•J
•M
•L
•G
•K
DO NOW…..CW #1 pg. 9 (1-9)

Line segment (segment): is a line with
endpoints.
A
Endpoints
Name the segment
B
AB or BA
Point M is between points
P and Q if and only if
P, Q and M are collinear