Lan geometri, segienam (heksagon) ya iku wangun segiakeh kanthi asma lan sisi cacahipun enam titik sudut.Wangun segienam katata (beraturan) nduwèni simbol Schläfli {6}.

Segienam beraturan
Segienam Katata(beraturan), {6}
sisi lan titik sudut	6
[[Simbol Schläfli	{6} t{3}
Diagram Coxeter–Dynkin
Grup simetri	Dihedral (D6)
Luas (s=panjang sisi)	${\displaystyle A={\frac {3{\sqrt {3))}{2))s^{2))$ ${\displaystyle \simeq 2.598076211s^{2}.}$
Sudut dalam	120°

Wagun segienam katata inggih punika ngadahi dawa utawa panjang sisi lan gedhé wujud sudut ingkang sami wujud lan gedhenipun. Sudut ing segienem ngadahi sudut 120°°. Segienam katata nduwèni enam simetri garis lan 6 simetri puter.

Jembar saking wangun segienem katata ngadahi dawa utawi panjang sisi s kaitung kanthi rumus ${\displaystyle A={\frac {3{\sqrt {3))}{2))t^{2}\simeq 2.598076211s^{2}.}$, sedangkan kelilingnya ${\displaystyle 6t\,\!}$, diameter gedhé ${\displaystyle 2t\,\!}$, lan diameter ciclik ${\displaystyle t{\sqrt {3))\,\!}$.

• Definition and properties of a hexagon With interactive animation
• Cassini Images Bizarre Hexagon on Saturn Archived 2010-09-27 at the Wayback Machine.
• Saturn's Strange Hexagon Archived 2010-02-16 at the Wayback Machine.
• A hexagonal feature around Saturn's North Pole
• "Bizarre Hexagon Spotted on Saturn" - from Space.com (27 March 2007)