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  2. Tetrahedron - Wikipedia

    en.wikipedia.org/wiki/Tetrahedron

    The height of a regular tetrahedron is ... formula for the volume of a tetrahedron ... especially in the numerical solution of partial differential equations.

  3. List of formulas in elementary geometry - Wikipedia

    en.wikipedia.org/wiki/List_of_formulas_in...

    Illustration of the shapes' equation terms. Cube. Cuboid. Prism. ... is the base's area and is the pyramid's height; Tetrahedron – , where is the side's length ...

  4. Trirectangular tetrahedron - Wikipedia

    en.wikipedia.org/wiki/Trirectangular_tetrahedron

    A trirectangular tetrahedron with its base shown in green and its apex as a solid black disk. It can be constructed by a coordinate octant and a plane crossing all 3 axes away from the origin (x>0; y>0; z>0) and x/a+y/b+z/c<1. In geometry, a trirectangular tetrahedron is a tetrahedron where all three face angles at one vertex are right angles.

  5. Simplex - Wikipedia

    en.wikipedia.org/wiki/Simplex

    The tetrahedron is the 3-simplex, a simple shape that requires three dimensions. ... (with n vertices) onto any polytope with n vertices, given by the same equation ...

  6. Solid angle - Wikipedia

    en.wikipedia.org/wiki/Solid_angle

    A useful formula for calculating the solid angle of the tetrahedron at the origin O that is purely a function of the vertex angles θ a, θ b, θ c is given by L'Huilier's theorem [6] [7] as

  7. Trigonometry of a tetrahedron - Wikipedia

    en.wikipedia.org/wiki/Trigonometry_of_a_tetrahedron

    The 12 face angles - there are three of them for each of the four faces of the tetrahedron. The 6 dihedral angles - associated to the six edges of the tetrahedron, since any two faces of the tetrahedron are connected by an edge. The 4 solid angles - associated to each point of the tetrahedron.

  8. Tetrahedral number - Wikipedia

    en.wikipedia.org/wiki/Tetrahedral_number

    A pyramid with side length 5 contains 35 spheres. Each layer represents one of the first five triangular numbers. A tetrahedral number, or triangular pyramidal number, is a figurate number that represents a pyramid with a triangular base and three sides, called a tetrahedron.

  9. Height function - Wikipedia

    en.wikipedia.org/wiki/Height_function

    A height function is a function that quantifies the complexity of mathematical objects. In Diophantine geometry, height functions quantify the size of solutions to Diophantine equations and are typically functions from a set of points on algebraic varieties (or a set of algebraic varieties) to the real numbers.