One dimensional is (probably) a line.
Two dimensional is a flat plain figure, showing length x width.
Three dimensional is a cubic shape, showing length x width x depth.
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They have one fewer dimension; they lack depth.
Polyhedrons are three-dimensional shapes with flat faces, straight edges, and sharp corners, known as vertices. Examples of polyhedrons include cubes, pyramids, prisms, and dodecahedrons. These shapes have a closed surface and are made up of polygons, which are two-dimensional shapes with straight sides.
two-dimensionalOn a+ the answer is three-dimensional
Some do, some don't. A regular polyhedron such as the tetrahedron has none whereas an irregular one like the parallelepiped can have several.
A rectangle is a two-dimensional shape, so it doesn't have faces in the way that three dimensional shapes have. A rectangle has four edges and four corners.