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What is the area of a regular octagon when given only a radius of 6? Please show your work - Quora
Area of an Octagon Calculator 📐
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How do you find the area of a regular octagon given a radius? | Socratic
The perimeter of an octagon
geometry - A circle of radius 1 is inscribed inside a regular octagon (a polygon with eight sides of length b). Calculate the octagon's perimeter and its area. - Mathematics Stack Exchange
Octagon Perimeter Formula
Program to calculate Area Of Octagon - GeeksforGeeks