Oktagon

Regular na oktagon
	Isang regular na oktagon
Type	pangkalahatang uri ng hugis na ito
Edges and vertices	8
Schläfli symbol	{8}
Coxeter–Dynkin diagrams
Symmetry group	Dihedral (D8)
Area	; (with a = edge length)
Internal angle (degrees)	135°
Properties	convex, cyclic, equilateral, isogonal, isotoxal

Ang oktagon(sa Ingles ay octagon mula sa Griegong okto, walo) ay isang poligon na may walong(8) gilid. Ang isang regular oktagon ay may simbolong Schläfli na {8}.

Regular na oktagon
Isang regular na oktagon
Type	pangkalahatang uri ng hugis na ito
Edges and vertices	8
Schläfli symbol	{8}
Coxeter–Dynkin diagrams
Symmetry group	Dihedral (D₈)
Area	$2(1+{\sqrt {2}})a^{2}$ $\simeq 4.828427a^{2}$ (with a = edge length)
Internal angle (degrees)	135°
Properties	convex, cyclic, equilateral, isogonal, isotoxal