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2 dimensional shapes are 2D shapes and polygons are plain shapes with no curves. So some 2D polygons would be squares , rectangle and many more . A circle would not be a 2D polygon.
this is the shape of 2d cone
2d means second, and 3d means third. For some reason, legal citation takes out the 'r' and the 'n' in the abbreviation.
A 2D sphere is a circle.
it a triangle as a 2d shape