octagon
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Both, in a way. An octagon gets its name from the word meaning, "eight angles" so an octagon can have eight unequal sides. However, a regular octagon is a closed eight-sided figure with sides of the same length and internal angles of the same size.
if the angles of a figure are the same but the sides aren't, it is similiar. Congruent is angles and sides exactly the same
An octagon is a polygon with eight sides and eight angles. All eight sides of an octagon are equal in length, and all eight angles are equal, measuring 135 degrees. These properties define the shape of an octagon and distinguish it from other polygons.
A pentagon has five sides and five angles.
...eight interior and exterior angles. ANGLES