This document defines key geometric concepts including points, lines, planes and their relationships. It explains that points have no size, lines extend indefinitely and planes are flat surfaces that extend without limits. It also covers topics like collinear points that lie on the same line, determining if objects are coplanar by lying on the same plane, and the different types of intersections between lines and planes, which can be a point, line or no intersection.

1. Lesson 1-3 Point, Line, Plane Lesson 1-3 Point, Line, Plane

6. Different planes in a figure: Lesson 1-3 Point, Line, Plane A B C D E F G H Plane ABCD Plane EFGH Plane BCGF Plane ADHE Plane ABFE Plane CDHG Etc.

11. Intersection of Two Planes is a Line. Lesson 1-3 Point, Line, Plane P R A B Plane P and Plane R intersect at the line

12. Planes can be perpendicular.

13. Planes can be parallel.

14. Planes can be… intersecting perpendicular parallel