An irregular octagon.
A four-sided polygon with all sides congruent and with four right angles is a square.
A four-sided polygon with four congruent sides and four equal angles is a square
an 8 sided polygon that has congruent angles, but not congruent side lengths
eight angles
octagon
It is a regular octagon.
It is a regular 8 sided octagon.
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a rhombus
A four-sided polygon with all sides parallel and congruent is a rhombus. If all the angles are equal, it is a special case of a rhombus called a square.
Providing it has no right angles then it is a scalene triangle.
A square or a rectangle