A 2D sphere is a circle.
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if it a 2D shape it would be a circle,but if it is a 3D shape it would be a sphere
A semicircle.
A circle perhaps?
Half a sphere, which is a 3D shape, is called a hemisphere. The semi-circles in the question is a 2D shape and will make a circle.
By definition a sphere is 3D. If it were only 2D it would be a circle.