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No, they are not.
Circles don't, but the others do, if you think of squares and rectangles as parallelograms.
Because of the lack of squares it has.
A shape that has all sides connected. Examples are squares, circles, ovals, octagons, etc.
There are a great many different shapes that are in Geometry. There are squares, circles, triangles, rhombus', and hexagons for example.