### Points, Lines, & Planes

# Points

# A point is an exact location in space. It has no size, only position. To show you this location, we are marking a point on the paper. This is just a model of a point.

To prevent points from being confused with one another and to ensure everyone understands which point we are referring to, points are named using uppercase letters.

# Lines ( Line - Line Segment - Ray )

## Line Segment

**AB**

## Line

## Ray

# Planes

A plane is an imaginary flat surface that has length and width but no thickness and goes on forever.

Imagine a thin veil over your classroom, and think of this veil extending beyond your classroom, the mountains and hills, out of the world, and on forever. This is a plane.

In the real world, there are no planes. When we draw something on a flat piece of paper, we are drawing on a piece/part/segment of a plane, except that the paper itself is not a plane because it has thickness!

Imagine a virtual, thickness-less screen protector on your computer screen; this is a piece of a plane.

# Why are planes so important?

**points and lines**. They form the foundation upon which all other geometric concepts are built.

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