None. It is not possible to make a sphere in that fashion.
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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.
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.
Don't make straight cuts.
you get a circle and put it together with another one
It makes a sphere