4LineA series of points that extends in two opposite directions without end.ABmNamed using:AB or line m
5Collinear points Points that lie on the same line BmCDPoints A, B, and C are collinearPoints A, C and D are noncollinear
6PlaneIt 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.
7CoplanarPoints and lines that lie in the same plane are called this
9POSTULATES: 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.
10Example 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 threeother ways..mA..GnBCDFEl
11Example 2 Name the plane represented by each surface of the box. The bottomThe topThe frontThe backThe right sideThe left sideMAHDNRIT