Point: no size, a small dot named by a capital letter.
Line: a series of points that extend in two opposite directions indefinitely
Collinear: points on the same line
Non-collinear: points not on the same line
Plane: extends infinitely in all directions; has no thickness
Notation: Plane R 3 or more non-collinear points
Coplanar: on the same plane
Non-coplanar: not on the same plane
Postulate: a statement accepted as fact
Post. 1-1: Through any 2 points, there is exactly 1 line
Post. 1-2: 2 lines intersect in exactly 1 point
Post. 1-3: 2 planes intersect in exactly 1 line
Post. 1-4: 3 non-collinear points make exactly 1 plane
Planes ABCD and EFDC intersect at . . .