Geometric properties of octagon

Math tutorials, Regular polygon, Geometry vocabulary

Octagon Shape Basics for Kids

geometry - How do I calculate certain angles determined by sides and diagonals of a regular octagon? - Mathematics Stack Exchange

Octagon - Wikipedia

Octagon - Definition, Formula, Examples

Octagon - Geometric Properties

What is an Octagon? - Answered - Octagon Shape Activities

Octagon - Wikipedia

Octagon Formula For Area and Perimeter With Derivation