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In geometry, an octagon is an eight-sided polygon or 8-gon. A regular octagon has Schläfli symbol {8} and can also be constructed as a quasiregular truncated square, t{4}, which alternates two types of edges.
Area = 2 * (1 + √2) * side2




A = 2 * (1 + √2) * side2 =
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