Regular Octagon -- from Wolfram MathWorld

Regular Hexagon -- from Wolfram MathWorld

Regular Hexagon -- from Wolfram MathWorld

Constructible Polygon -- from Wolfram MathWorld

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Polygon -- from Wolfram MathWorld

ReuleauxPolygon Wolfram Function Repository

Regular Octagon -- from Wolfram MathWorld

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Octagon - Wikipedia

Regular Octagon -- from Wolfram MathWorld

BillPicture Regular polygon, Dodecagon, Geometry

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