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An octagon is a polygon that has eight sides. A regular octagon is one in which all the sides are of equal length and all angles are equal. The shape of a "STOP" sign is a regular octagon, as this makes it easy to
recognise even when it is covered in dirt or snow.
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irregular |
concave |
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In architecture, an octagon house is a house built in an octagonal shape. Monticello is the most famous example.
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