2. Geometry
Chapter 1-1

3. Why do chairs sometimes wobble?
What do the feet of a three legged stool represent?
Points that lie in the same plane.
Why does a four legged chair sometimes wobble on a flat surface?
One of the legs represents a point that doesn’t lie in the same plane as the other 3.

4. Key Terms A point is simply a location
A line is made up of points that has no thickness or width.
Points that are on the same line are said to be collinear.

7. Terms cont… A plane is a flat surface made up of points.
Points that lie on the same plane are said to be coplanar.
A plane has no depth and extends infinitely in all directions.
Points are often used to name lines and planes.