# Irrational Numbers

An** irrational number** cannot be expressed in the form of a fraction because there are an infinite number of non-recurrent decimal places.

An example of an **irrational number** is , which is defined as the relationship between the perimeter of the circle and its diameter.

= 3.141592653589...

Other** irrational numbers** are:

The number **e** = 2.718281828459...

The ** golden ratio**

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