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Regular octagon
Regular polygon 8 annotated.svg
A regular octagon
TeepRegular polygon
Edges an vertices8
Schläfli seembol{8}, t{4}
Coxeter diagramCDel node 1.pngCDel 8.pngCDel node.png
CDel node 1.pngCDel 4.pngCDel node 1.png
Symmetry groupDihedral (D8), order 2×8
Internal angle (degrees)135°
Dual polygonSel
PropertiesConvex, 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}.