Presentation on theme: "Chapter 1 1.2 Points, Lines, and Planes Point A location, represented by a capital letter, has no size."— Presentation transcript:
Chapter Points, Lines, and Planes
Point A location, represented by a capital letter, has no size.
Space A set of points.
Line A series of points that extends in two opposite directions without end. AB m Named using: AB or line m
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
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.
Coplanar Points and lines that lie in the same plane are called this
Postulate or axiom An accepted statement of fact.
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.
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
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