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Chapter 1-2: Points, Lines, and Planes

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

Problem 1-2

Planes ABCD and EFDC intersect at . . .

Point C

Line BC

Line DC