WEST Middle Grades Math: Similar Polygons - Videos & Lessons

About This Chapter

Geometry is a big part of the WEST Middle Grades Math certification assessment; use these fun video lessons to review the similar polygons concepts educators need to know. If you have any questions about the material in this chapter, let our instructors know.

WEST Middle Grades Math: Similar Polygons - Chapter Summary

If you need help reviewing similar polygons for your WEST Middle Grades Math assessment, this chapter offers a number of great resources. Short video lessons and thorough companion transcripts review:

Ratios and proportions
The formula for geometric mean
Problems with proportions
Similar triangles and the transitive property
The triangle proportionality theorem
How to construct similar polygons

Each lesson is followed by a quick self-assessment that lets you practice using the ideas, pinpoint areas that need more review, and gain confidence with the material. If you get stuck on any of the concepts presented here, don't hesitate to let our instructors know you need some help.

9 Lessons in Chapter 44: WEST Middle Grades Math: Similar Polygons

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1. Ratios and Proportions: Definition and Examples

Watch this video lesson to learn how ratios and proportions are related. Also, learn how ratios and proportions are used in real life and how you can apply them to yours.

2. Geometric Mean: Definition and Formula

Watch this video lesson to learn how different the geometric mean is from the arithmetic mean, or average, that we are all so familiar with. Learn in what circumstance the geometric mean is preferred. Also, learn the formula and how to use it.

3. Solving Problems Involving Proportions: Definition and Examples

Learn how you can use proportions to find missing sides and how to increase or decrease the sizes of objects to create models of them in this video lesson.

4. Similar Polygons: Definition and Examples

Watch this video to learn what makes two polygons similar to each other. You'll also learn the one distinguishing aspect of similar polygons and see an example of how to compare two polygons.

5. Similar Triangles & the AA Criterion

This video lesson explains the AA criterion and shows you why you only need two corresponding angles to be equal for two triangles to be similar. You will also see how you can use it to help you identify similar triangles.

6. The Transitive Property of Similar Triangles

Watch this video lesson and you will understand what the transitive property is and how it applies to similar triangles. Watch as we apply the transitive property to three similar triangles.

7. Triangle Proportionality Theorem

Watch this video lesson to learn all about the triangle proportionality theorem and how you can use this interesting theorem to help you solve problems. Learn how a parallel line can create sides that are proportional to each other.

8. Constructing Similar Polygons

This lesson will teach you how to construct similar polygons, which are very useful in many quantitative fields. You'll learn that all of this has something to do with, of all things, snowflakes!

9. Properties of Right Triangles: Theorems & Proofs

In this lesson, you will learn about the properties of and theorems associated with right triangles, which have a wide range of applications in math and science. Specifically, we will discuss and prove the Pythagorean theorem and the right triangle altitude theorem. Let's get started.

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