# Geometry Notes 1.1: Points,Lines, and Planes

- Author:
- cprystalski

**point**is a location and is named by a capital letter. A

**line**is made up of points and has no thickness or width. It is named with two letters representing points on the line, or a lowercase script letter. A

**plane**is an infinite flat surface made up of points and is named by a capital script letter or by three letters representing non collinear points on a plane.

**Collinear**points can be contained on a line.

**Coplanar**points can be contained on a plane.

1. Name 3 collinear points

2. Name 3 noncollinear points:

3. Name a plane.

4. Name in a different way. (Choose all that apply)

5. If possible, draw a line through E and C. Are E and C collinear?

6. If possible, draw a line through E, G, and C. Are E, G, and C collinear?

7. If possible, name two points that are non collinear, because you CANNOT draw a line through them.

8. If possible, draw a plane through D, B, and F. Are D, B, and F coplanar?

9. If possible, draw a plane through A, G, E, and B. Move the diagram around to see if the four points are on the plane. Are A, G, E, and B coplanar?

10. If possible, name 3 points that are NOT coplanar, because you CANNOT draw a plane through them.

11. Name the intersection of and .

12. Name the intersection of and (the lines are not shown)