Irregular Octagon calculator and formula

This function calculates various parameters of an irregular octagon (stretched octagon).

Enter the lengths a and b for the calculation. Then click on the 'Calculate' button.

Irregular octagon calculator

Input

Short side a

Long side b

Decimal places

Results

Length l

Height h

Diagonal d

Perimeter U

Area A

Formulas for the irregular octagon

\(\displaystyle l=a·(1+\sqrt{2})+b-a \)

\(\displaystyle h=a·(1+\sqrt{2})\)

\(\displaystyle d=\sqrt{l^2+a^2}\)

\(\displaystyle P=6·a+2·b\)

\(\displaystyle A = 2 · a^2 · ( 1 + \sqrt{2} ) + h · ( b - a )\)