Section 1.2. Points, Lines, and Planes. Definitions:. A point is a location. It has no size, represented by a small dot and named by a capital letter. Space is the set of all points.
Points, Lines, and Planes
A point is a location. It has no size, represented by a small dot and named by a capital letter.
Space is the set of all points.
A line is a series of points that extends in two opposite directions without end. Named by: any TWO points or a lowercase letter.
Name the line:
Collinear points are points that lie on the same line.
A plane is a flat surface that has no thickness. It contains many lines and extends without end in all directions. You can name a plane by a single capital letter or THREE noncollinear points.
Two points or lines are coplanar if they lie in the same plane.
How would I label the plane boxed in RED?
Name another plane.
How many different planes do you see?
Remember- Coplanar objects (points or lines) are
objects that lie on the same plane.
Are the following points coplanar?
Ex. A stool can stand with only 3 legs.