I don't think it's a troanglo. I believe it's called a tetrodahn.
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There is no such thing as a 3D triangle.
No. A 3D triangle would be a triangular based pyramid.
triANGLE
A triangle is a 2D object, and faces can only be found on 3D objects.But yes, the bottom line of a triangle is still a side, and the bottom face of a 3D object with a triangular face is still a face.
6 because 3x2