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Half of it.
No edges, no corners, but it is considered to have 1 face.
Technically, a sphere doesn't have any faces, as it has no vertexes or sides. It could be considered as having an infinite number of faces as well. The Surface of a sphere is continuous, as opposed to discrete, so it has no real faces.
The lower part of the mantle between the asthenosphere and the outer core.
In 2D, there is the regular circle and the oval. In 3D, there is the sphere (I am not entirely certain this a considered a circle though).