Geometric properties of octagon

Octagon

Octagon: Shape, Sides, Angles, Meaning, Formula - Embibe

What is a shape with eight sides called?

What is the measure of an interior angle of a regular octagon?

What is the measure of each interior angle of regular octagon? - Quora

Octagon Shape, Area & Angles - Video & Lesson Transcript

Octagon - Definition, Formula, Examples

Octagon Shape - Definition, Properties, Formula, Examples, Sides and angles

Geometric Shapes Images, Chart, and Maths Examples

Regular Octagon -- from Wolfram MathWorld