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  2. Eberhard's theorem - Wikipedia

    en.wikipedia.org/wiki/Eberhard's_theorem

    A hexagon bisects the cube into two copies of a simple polyhedron with one hexagonal face, three isosceles right triangle faces, and three irregular pentagonal faces. It is not possible to form a simple polyhedron using only three triangles and three pentagons, without the added hexagon.

  3. Hexagonal number - Wikipedia

    en.wikipedia.org/wiki/Hexagonal_number

    Every hexagonal number is a triangular number, but only every other triangular number (the 1st, 3rd, 5th, 7th, etc.) is a hexagonal number. Like a triangular number, the digital root in base 10 of a hexagonal number can only be 1, 3, 6, or 9. The digital root pattern, repeating every nine terms, is "1 6 6 1 9 3 1 3 9". Every even perfect number ...

  4. Truncated tetrahedron - Wikipedia

    en.wikipedia.org/wiki/Truncated_tetrahedron

    Given the edge length .The surface area of a truncated tetrahedron is the sum of 4 regular hexagons and 4 equilateral triangles' area, and its volume is: [2] =, =.. The dihedral angle of a truncated tetrahedron between triangle-to-hexagon is approximately 109.47°, and that between adjacent hexagonal faces is approximately 70.53°.

  5. Floor and ceiling functions - Wikipedia

    en.wikipedia.org/wiki/Floor_and_ceiling_functions

    n > 0 is the number of letters in the alphabet (e.g., 26 in English) the falling factorial = (+) denotes the number of strings of length k that don't use any character twice. n! denotes the factorial of n; e = 2.718... is Euler's number; For n = 26, this comes out to 1096259850353149530222034277.

  6. Truncated octahedron - Wikipedia

    en.wikipedia.org/wiki/Truncated_octahedron

    The truncated octahedron has 14 faces (8 regular hexagons and 6 squares), 36 edges, and 24 vertices. Since each of its faces has point symmetry the truncated octahedron is a 6 - zonohedron . It is also the Goldberg polyhedron G IV (1,1), containing square and hexagonal faces.

  7. Surface area - Wikipedia

    en.wikipedia.org/wiki/Surface_area

    A sphere of radius r has surface area 4πr 2.. The surface area (symbol A) of a solid object is a measure of the total area that the surface of the object occupies. [1] The mathematical definition of surface area in the presence of curved surfaces is considerably more involved than the definition of arc length of one-dimensional curves, or of the surface area for polyhedra (i.e., objects with ...

  8. Hexagonal tiling - Wikipedia

    en.wikipedia.org/wiki/Hexagonal_tiling

    In geometry, the hexagonal tiling or hexagonal tessellation is a regular tiling of the Euclidean plane, in which exactly three hexagons meet at each vertex. It has Schläfli symbol of {6,3} or t {3,6} (as a truncated triangular tiling).

  9. Truncated icosidodecahedron - Wikipedia

    en.wikipedia.org/wiki/Truncated_icosidodecahedron

    The truncated icosidodecahedron has seven special orthogonal projections, centered on a vertex, on three types of edges, and three types of faces: square, hexagonal and decagonal. The last two correspond to the A 2 and H 2 Coxeter planes .

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