No, an octagon is not a quadrilateral. An octagon is a polygon with eight sides and eight angles, while a quadrilateral is a polygon with four sides and four angles. The two shapes differ in the number of sides, making them distinct categories of polygons.
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octogon
An octogon can be regular (all sides of equal length) or irregular (all sides not of the same length).
An octogon
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an octogon
An octogon.