it has 0 curved faces
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A tetrahedron is a triangular based pyramid that has 4 faces, 6 edges and 4 vertices.
None normally
A pyramid has 5 flat surfaces, 4 for the walls and 1 for the bottom.
Five: Four sides and the base.
There are five faces in a triangular pyramid. Gosh person, use your math book! Sorry you are wrong. It depends on the base if it is a square it has 5 surfaces if the base is a triangle it has 4 surfaces. So you must examine your pyramid carefully so as not to make a simple mistake.