They are regular polygons such as a square or an equilateral triangle.
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A square is a four-sided shape with all sides equal and all angles equal.
No shape has four equal sides and four different angles - either there are two pairs of equal angles, or all four angles are the same; or all sides are not the same length.
A parallelogram.
square
A shape with six sides is a hexagon. A hexagon with all sides and angles equal is a regular hexagon.