+An octagon is a [polygon](/wiki/polygon) defined by eight straight sides and eight angles. In a regular octagon, all sides are equal and each interior angle measures 135 degrees. This [geometric shape](/wiki/shape) appears in various designs, from stop signs to architectural layouts.
+## See also
+- [Hexagon](/wiki/hexagon)
+- [Square](/wiki/square)
+- [Circle](/wiki/circle)
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