*Contributor: Marlene Vogel. Lesson ID: 10906*

Points, lines, and planes are the "stars" of geometry, and they are all around us! Learn important vocabulary words and simple concepts, then create your own artwork to display what you've learned!

categories

subject

Math

learning style

Visual

personality style

Beaver, Golden Retriever

Grade Level

High School (9-12)

Lesson Type

Dig Deeper

Constellations are a great way to learn about points, lines, and planes!

Below are pictures of three constellations in the night sky (without the lines). Do you think you can draw the lines to make the correct picture of each constellation?

(Access the **Constellations** and **Constellations Answer Key** documents in Downloadable Resources in the right-hand sidebar to complete this activity.)

**Vocabulary** Look up these definitions at Mathwords.com, and be sure to write them down and even memorize them!

*collinear**coplanar**line**plane**point**postulate*

Although you now have the definitions of the vocabulary words listed above, sometimes math terms are easier to understand when put into an explanation. The following is a discussion concerning how the vocabulary words above relate to each other and geometry:

A *point* can be thought of as a *location*. Consider your computer screen. If you place your finger on it, you have just identified a point. If you move your finger to another place on your computer screen, then you have located another point. You use a capital letter whenever labeling a point in geometry. Points are located *everywhere*!

A series of points is a *line*. A line extends in both directions indefinitely. You label a line by listing two of the points found on it. All points located on the same line are referred to as being *collinear*.

A *plane* is flat surface that extends in all directions. It is very important to note that a plane does not have any thickness. You label a plane simply with one capital letter, or by naming 3 non-collinear points on the plane.

Finally, all lines and points located on the same plane are referred to as *coplanar*.

A *postulate* is a statement in math that is accepted as true. It does not need to be proven. Below are 4 postulates and an example of each. You may recognize them from your algebra lessons.

- Postulate 1-1: Through any two points there is exactly one line.
- Postulate 1-2: If two lines intersect, then they intersect in exactly one point.
- Postulate 1-3: If two planes intersect, then they intersect in a line.
- Postulate 1-4: Through any three non-collinear points there is exactly one plane.

The next two sections of the lesson offer opportunities for you to expand your knowledge of the above geometric terms and postulates.

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