yes at least 1 face
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no. a 2d square has only 1 face but a 3d square (cube) has 6 faces.
An octahedron is a closed 3-d shape with 8 polygonal faces. There are 257 topologically different convex octahedra. They can have faces which are triangles, quadrilaterals, pentagons, hexagons or heptagons.
Only one; a triangle is a 2D shape, not a 3D shape. Usually only 3D (or more) shapes are considered to have 'faces'.
what are the 2d shapes of the real world
5 edges, 5 verts, and faces are only on 3d shapes, for the most part, so any 2d shape has 1