Hémisphère (mostly used in geography = "l'hémisphère nord, l'hémisphère sud).
une demi-sphère (more familiar, used for describing the shape of something or calculations of volume, etc..)
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A sphere that's cut in half o.o
Find the volume for the whole sphere (4/3 x pi x radius cubed) then divide by two.
a Sphere.
A hemisphere
Because the literal meaning of polyhedron means 'many faces' A sphere has only one face.