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Octagon - Wikipedia
Regular Polygon -- from Wolfram MathWorld
Can we see a circle as a regular polygon with an infinite number of sides? Why? - Quora
Folding -- from Wolfram MathWorld
Regular Octagon -- from Wolfram MathWorld
Octagon - Wikipedia
Regular Polygon Calculator
Hexaflake, nflake, pentagonal Tiling, wolfram Research, mathworld, Iteration, tessellation, pentagon, Fractal, geometric Shape
Braced Polygon -- from Wolfram MathWorld
Regular Octagon -- from Wolfram MathWorld
Wolfram Mathworld in the Notebook Archive
Octagon - Wikipedia