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If you mean a tetrahedron then it is a triangular based pyramid with 4 flat faces
If you mean a triangular pyramid then it has four faces, one base and three sides.
Faces are a term used in Geometry to describe a side on a three-dimensional figure
A triangular solid has 4 faces. Hope I helped!!
Shapes have sides. Do you mean, what shape has 6 sides or, what solid has 6 faces?