**Geometric Mean of Two Numbers**

The **geometric mean of two numbers** is the principal or the positive square root of the product of the two numbers.

For example, find the geometric mean of 2 and 18.

First, we find the product of 2 and 18, that is 2 \times 18=36.

The geometric mean is just the positive square root of their product which is \sqrt {36}=6 .