Section 1.2

# Section 1.2

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## Section 1.2

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1. Section 1.2 Points, Lines, and Planes

2. 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.

3. 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.

4. How would I label the plane boxed in RED?

5. Name another plane.

6. How many different planes do you see?

7. 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 ?

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

9. Ex. A stool can stand with only 3 legs.

10. Homework