Square. By definition, its sides must all be equal.
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It is an irregular shape or polygon that doesn't have all sides equal
A square is a four-sided shape with all sides equal and all angles equal.
A shape with six sides is a hexagon. A hexagon with all sides and angles equal is a regular hexagon.
This shape is called an icosikaitera. All of the sides of the icosikaitera are all of the same equal length.
A pentagon