There are regular octagons, and irregular octagons.
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An 8 sided octagon can be either regular or irregular in shape.
An octagon can be an irregular shape, but a regular octagon has all sides and angles equal.
A regular octagon has 8 line of symmetry.
The measure of one of the regular octagon angles of the shape is 135 degrees, regardless of the size of the octagon. This means that the interior angles are all 135.
A plane shape is regular if each of its sides is of the same length AND each of its angles is of the same measure. An octagon can be regular or irregular.