It all depends on what the base is. Th number of faces a pyrimad has is the number sides on the base+1. So for example, a square pyrimad (one of the most common) would have 4 +1 or 5 sides.
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You are a square based pyramid that has 5 faces, 8 edges and 5 vertices.
10 faces 10 faces
A trapezoid is a quadrilateral and has four faces.
A hexahedron has 6 faces.
20 faces