A circle perhaps?
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A 2D sphere is a circle.
A semicircle.
if it a 2D shape it would be a circle,but if it is a 3D shape it would be a sphere
By definition a sphere is 3D. If it were only 2D it would be a circle.
There is no 2D shape that makes a sphere, since a sphere is 3D by definition. The closest thing to a 2D sphere is a circle.