, is a figure of 8 sides and angles; which, when these are all equal, is also called a regular one, or may be inscribed in a circle.
If the side of a regular Octagon be s; then
Its area ; and the Radius of its circumsc. circle .
Octagon, in Fortification, denotes a place that has 8 sides, or 8 bastions.
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Entry taken from A Mathematical and Philosophical Dictionary, by Charles Hutton, 1796.
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