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This is a list of two-dimensional geometric shapes in Euclidean and other geometries. For mathematical objects in more dimensions, see list of mathematical shapes. For a broader scope, see list of shapes.
Tessellations of euclidean and hyperbolic space may also be considered regular polytopes. Note that an 'n'-dimensional polytope actually tessellates a space of one dimension less. For example, the (three-dimensional) platonic solids tessellate the 'two'-dimensional 'surface' of the sphere.
In solid geometry, a face is a flat surface (a planar region) that forms part of the boundary of a solid object.For example, a cube has six faces in this sense.. In more modern treatments of the geometry of polyhedra and higher-dimensional polytopes, a "face" is defined in such a way that it may have any dimension.
A net of a 4-polytope, a four-dimensional polytope, is composed of polyhedral cells that are connected by their faces and all occupy the same three-dimensional space, just as the polygon faces of a net of a polyhedron are connected by their edges and all occupy the same plane.
These bounding sub-polytopes may be referred to as faces, or specifically j-dimensional faces or j-faces. A 0-dimensional face is called a vertex, and consists of a single point. A 1-dimensional face is called an edge, and consists of a line segment. A 2-dimensional face consists of a polygon, and a 3-dimensional face, sometimes called a cell ...
12 3-dimensional "pure" apeirohedra based on the structure of the cubic honeycomb, {4,3,4}. [22] A π petrie dual operator replaces faces with petrie polygons; δ is a dual operator reverses vertices and faces; φ k is a kth facetting operator; η is a halving operator, and σ skewing halving operator.
The corresponding faces of the two cubes are connected to form the remaining 6 cubical faces of the tesseract. The 24-cell can be derived from the tesseract by joining the 8 vertices of each of its cubical faces to an additional vertex to form the four-dimensional analogue of a pyramid. Both figures, as well as other 4-dimensional figures, can ...
Toggle Two dimensional (polygons) subsection. 2.1 Star polygons. 2.2 Families. ... Four-dimensional space. 4-polytope – general term for a four dimensional polytope
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