The Length of Sides of an Octagon calculator determines the length each side needs to be to construct an octagon with a given diameter
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An octagon can have two different types of diameters. The first is measuring a line perpendicular to the two parallel sides of the octagon. The radius that results from this measurement is called the apothem or inradius. The second way is to measure across from angle to opposite angle. The radius resulting from this diameter is called the circumradius or sometimes just radius. Determine which way you are measuring the size of your desired octagon and select the correct option from the dropdown.