**Octagon Measurement Calculator - Had2Know**
https://www.had2know.com/academics/octagon-measurement-calculator.html

The side length, height, diagonals, and area of a regular octagon are all interrelated. If you know the measure of one dimension, you can calculate the others. For example, if the side length is s, the height h, the main diagonal d, the minor diagonal c, the area a, and the perimeter p, then you can calculate the following from s: h = (1+√ 2 )s. d = (√ 4+2 )s.

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