If drawn on a flat plane (paper, for instance), then yes, they are a 2D shape.
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Squares, circles, rectangles, trapeziums, hexagons, pentagons, octagons
Rectangles, squares, and right triangles always have.Every 2D shape with more than 2 sides can have a right angel but doesn't need to.
what are the 2d shapes of the real world
the cylinder has 2 2d shapes: the 2 circles on the end
Polygons are 2d shapes whereas polyhedrons are 3d shapes