# Golden Section

## Or Golden Mean

The *Golden Section* (or *Golden Mean*) is an irrational proportion defined as a line cut in such a way that

- the
*ratio between the smaller section to the greater*- equals the*ratio of the greater section to the whole line*

The *Golden Section* can be expressed like

*AB / BC = BC / AC (1)*

The ratio of the two lengths is called *phi - Φ = 1.618*