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Regular octagon
Regular polygon 8 annotated.svg
A regular octagon
Teep Regular polygon
Edges an vertices 8
Schläfli seembol {8}, t{4}
Coxeter diagram CDel node 1.pngCDel 8.pngCDel node.png
CDel node 1.pngCDel 4.pngCDel node 1.png
Symmetry group Dihedral (D8), order 2×8
Internal angle (degrees) 135°
Dual polygon Sel
Properties Convex, cyclic, equilateral, isogonal, isotoxal

In geometry, an octagon (frae the Greek ὀκτάγωνον oktágōnon, "aicht angles") is a regular polygon that haes aicht sides. A regular octagon is representit bi the Schläfli seembol {8}.