1. Section 1.1 Points, Lines, and Planes

2. Point No size or dimension, merely position. P Written as: P Written using a single, capital letter.

3. Line Contains infinitely many points extending in opposite directions. AB h C Written as: Any two points name the line, order does NOT matter.

4. Plane An imaginary, perfectly flat surface with no thickness that extends endlessly in all directions. M Written as: M Plane can be named using a single capital letter OR using three or four points. Ex. Plane M or Plane ABC or ABC

5. Collinear Points Points that lie on the same line. ABC A, B, and C are collinear points.

6. Noncollinear Points Points that do not lie on the same line. Ex. P and R are noncollinear points. Ex. S and P are noncollinear points. PQ R S

7. Coplanar Points Points that lie on the same plane. M N P P, M, and N are coplanar points.

8. Noncoplanar Points Points that do not lie on the same plane. B M A N A, B, M, and N are noncoplanar points. A B C D E

9. Intersection The set of points that lie in both figures. R R is the intersection of the two lines.

10. Diagram A B C D E D A B C E F G Use the diagram to answer the following.

11. Are A, D, C, and F are coplanar ? Are D, E, B, and G are coplanar ? How many points are contained in Plane ABCD ? Can a point be in more than one line ? Name the intersection of Plane DEFC and Plane BGFC ? Name two planes that do not intersect. Questions…