Slide 2 Chapter 1 1.2 Points, Lines, and Planes Slide 3 Point A
location, represented by a capital letter, has no size. Slide 4
Space A set of points. Slide 5 Line A series of points that extends
in two opposite directions without end. AB m Named using: AB or
line m Slide 6 Collinear points Points that lie on the same line AB
m C D Points A, B, and C are collinear Points A, C and D are
noncollinear Slide 7 Plane It is a flat surface that has no
thickness. It contains many lines and extends without end in the
directions of all of its lines. It is names either by a single
capital letter, or by at least 3 noncollinear points. Slide 8
Coplanar Points and lines that lie in the same plane are called
this Slide 9 Postulate or axiom An accepted statement of fact.
Slide 10 POSTULATES: 1-1: Through any two points there is exactly
one line 1-2: If two lines intesect, then they intersect in exactly
one point. 1-3: If two planes intersect, then they intersect in
exactly one line. 1-4: Through any three noncollinear points, there
is exactly one plane. Slide 11 Example 1: Are the three points
collinear? If so, name the line on which they lie. A, D, E ? B, C,
D ? A, E, C ? Name line m in three other ways. A. G C F B D. E. m n
l Slide 12 Example 2 Name the plane represented by each surface of
the box. The bottom The top The front The back The right side The
left side M A I D R H N T
