Octagon Formulas

1. Area of Regular Octagon Formula

Area = 2 \times s 2 \times (1 + \sqrt 2)

The area is calculated using side length (s) and √2.

Perimeter = 8 \times s

The perimeter is 8 times the side length (s).

a = \frac{s \times \sqrt 2}{2}

The apothem is found by multiplying side length (s) by √2 and dividing by 2.

θ = \frac{180 \times 6}{8}

Each interior angle is 135°.

Exterior Angle = \frac{360}{8}

Each exterior angle is 45°.