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**Chapter 1-3 Points, Lines and Planes**

Geometry Chapter 1-3 Points, Lines and Planes

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**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.

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**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.

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**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.

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Postulates You need two points to describe a line, and three noncollinear point to describe a plane. Postulates are statements that are accepted without further justification.

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**Finally Line segments consists of endpoints**

A ray has and endpoint and a side that continues forever.

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Classwork/Homework Pg 17 #s 2-34 even

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