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A 3D shape (for example a cube) has length, width and depth. A cube will show a 2D face when viewed squarely on, so that the sides are not on view.
yes at least 1 face
2d shapes only have length and width, while 3d shapes have length, width and depth.
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'.