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# Section 1.2 PowerPoint PPT Presentation

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.

Section 1.2

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## 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.

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 few more definitions:

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?

ABC ?

ABCF ?

HGFE ?

EHCB ?

AGF ?

CBFH ?

### A postulate or axiom is an accepted statement of fact.

Ex. A stool can stand with only 3 legs.