Two. One which is flat and the other which is curved.
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One edge, no vertices and two faces.
A hemisphere as two faces (one curved and one plane), one edge and no vertices.
A hemisphere has one edge, two faces and no vertices.
A hemisphere
Hemisphere: 2 faces, 1 edge, 0 vertices Square-based pyramid: 5 faces, 8 edges, 5 vertices Cube: 6 faces, 12 edges, 8 vertices