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.
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The face of a triangle is the flat surface of the solid figure. _________________________________________________ A face is a side of a 3 dimensional figure. So, the number of faces a triangle would be 0.
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A tetrahedron is an example of a triangular pyramid. Every face is a triangle, and each face touches every other face on one edge.
It's called a pyramid!
An upside-down triangle. It does not matter from which direction you view a triangle, it will still be a triangle.