construct a Regular octagon inside a circle (Step-by-Step)

Octagon - Wikipedia

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Construction of a Regular Octagon

How to make a perfect octagon inside a circle: Step-by-step guide

How to Draw an Octagon (with Pictures) - wikiHow

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Constructing Equilateral Triangles, Squares, and Regular Hexagons Inscribed in Circles - Video & Lesson Transcript

How to Draw an Octagon (with Pictures) - wikiHow

How to Draw an Octagon (with Pictures) - wikiHow

How to draw a regular octagon within a circle

How to Make an Octagon: 4 Easy Methods