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a half-sphere is called "hemisphere"
A hemisphere is half a sphere
Sphere is whole a hemisphere is not
The word for half a sphere is a hemisphere.
A hemisphere is a half of a sphere, divided by a plane passing through its center. It has a flat base where the cut was made, while a sphere is a three-dimensional shape with no flat surfaces. The hemisphere has a curved surface area and volume that are half that of a full sphere.