### Square root of two

The square root of the number two is

##### Explanation

The ratio between the side and the diameter of a square cannot be written by any pair of whole numbers. So they are incomparable. Because of this √2 is called an irrational number. On your calculator you can see that √2 = 1.4142135... and it lies on the number line between 1 and 2.

1 √2 1

##### Additional information

In the pythagorean school this was regarded as a proof of demonstation, that integers are not qualified to describe the real world.