# Irrational Numbers

A** number** is irrational if there are** infinite decimal places non-recurrent**, therefore** it cannot be expressed in the form of fraction. **

The best known ** 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** appears in growth processes, in radioactive decay and in the formula of the catenary, which is the curve that is found in power lines.

**e =** 2.718281828459...

The ** golden ratio**, , used by artists from all periods (Phidias, Leonardo da Vinci, Alberto Dürer, Dalí,..) in the proportions of their works.

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