In geometry, a hexagon (from Greek ἕξ, hex, meaning “six”, and γωνία, gonía, meaning “corner, angle”) is a six-sided polygon. The total of the internal angles of any simple (non-self-intersecting) hexagon is 720°.
https://github.com/davepinch/pinchy.cc/blob/master/content/topics/mathematics/shapes/hexagon/wikipedia/en.wikipedia.org.md
