1 face because a face is like a side and in 2d objects there is always only 1 face. I think but I haven't done this in a while.
P.S. Ovechkin rocks!
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No. A triangle is a two-dimensional polygon (flat figure). It has sides that consist of three line segments, with an interior area. Only a three-dimensional form (polyhedron) can have faces. Triangles serve as faces for any number of polyhedrons, such as pyramids.
None since there is no such thing as a traingle! A triangle, on the other hand, has one face - the same as any two dimensional closed figure.
A cube is specifically a three-dimensional object in geometry and therefore cannot be two-dimensional.
As triangle has height and width its two dimensional one
One. A square is a two dimensional image.