If a face is defined as a flat surface, then a sold hemisphere has 1 face. A hollow hemisphere has 0 faces.
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there are 2 faces on a hemisphere the round side and the flat side
There is one face on a hemisphere.
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A rectangle is a 2D object with four sides or edges, but does not have any faces. Only 3D objects have faces. A rectangular pyramid has six faces.
There are 10 vertices on a pentagonal prism. In geometry, a pentagonal prism is a prism that has 7 faces, 15 edges, and 10 vertices.