Un otagon (de elinica antica ὀκτάγωνον oktágōnon oto angulos, de ὀκτώ oktṓ oto e γωνία gōnía angulo) es un poligon con oto lados reta e oto angulos.
Cada angulo es 135°, e tota angulos es 1080°.
La perimetre de la otagon con longia de lado reta a es:
La area es:
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