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Line 1: − An eight-sided [[polygon]].+ − + + + + + + +
area, cat
[[Image:octagon.gif|thumb|A regular octagon]]
[[Image:octagon.gif]]
An '''octagon''' is an eight-sided [[polygon]].
The area of a [[Regular polygon|regular]] octagon with side = a is given by:
<math>2(1 + \sqrt{2})a^2</math>
[[Category:Geometry]]