# Geometry/Chapter 4/Lesson 7

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## Introduction[edit | edit source]

This lesson of Chapter 4 of "Geometry" will introduce you to "Geometric Mean". For more info on this topic, see the wikipedia article, w:Geometric Mean.

## Geometric Mean[edit | edit source]

The **Geometric Mean** is an "average formula" where two numbers or three numbers are multiplied together. We then find the square root, for two numbers, or the cube root, for three numbers. The "Geometric Mean" requires a proficient understanding of radicals and simplify radicals.

- Let's find the Geometric Mean of and .

- •

- • =

- Find the square root of both factors.
- √
^{2}√

- √
- After simplifying our roots, we get: √

**Answer**: The Geometric Mean between and is √.