Click on the faces to color them. To change the color, click on the same region again

In [url=https://en.wikipedia.org/wiki/Mathematics]mathematics[/url], the [url=https://en.wikipedia.org/wiki/Four_color_theorem]four color theorem[/url] states that, given any separation of a plane into [url=https://en.wikipedia.org/wiki/Contiguity#Geography]continuous[/url] regions, producing a figure called a [i]map[/i], no more than four colors are required to color the regions of the map so that no two adjacent regions have the same color.

Updated version using [url=https://www.geogebra.org/material/show/id/pGCXX3wW]Coloreando el mapa[/url] by [url=https://www.geogebra.org/ilarrosa]Ignacio Larrosa Cañestro.[/url]