ⓘ List of triangle topics
This list of triangle topics includes things related to the geometric shape, either abstractly, as in idealizations studied by geometers, or in triangular arrays such as Pascals triangle or triangular matrices, or concretely in physical space. It does not include metaphors like "love triangle" in which the word has no reference to the geometric shape.
1. Number theory
Triangular arrays of numbers
 Floyds triangle
 Eulerian number
 Bell numbers
 Rombergs method
 Boustrophedon transform
 Narayana number
 Triangular pyramidal number
 Rencontres numbers
 Triangular number
 Lozanics triangle
 Pascals triangle
 Stirling numbers of the second kind
 Stirling numbers of the first kind
The incomplete Bell polynomials from a triangular array of polynomials see also Polynomial sequence.
Integers in triangle geometry
 Integer triangle
 Eisenstein triple
 Heronian triangle
 Pythagorean triple
 quadri  figures quadrilaterals and systems of four lines and polygon geometry. See external links List of triangle topics Triangle center This is PART 17: Centers
 of triangle inequalities List of triangle topics Pedal triangle Pedoe s inequality Pythagorean theorem Pythagorean triangle Right triangle Triangle inequality
 matrix Pascal s pyramid Pascal s simplex Pascal s triangle Permutation List of permutation topics Pochhammer symbol also falling, lower, rising, upper
 dimension. List of geometry topics List of geometric shapes List of curves topics List of triangle topics List of circle topics List of topics related to
 A triangle is a polygon with three edges and three vertices. It is one of the basic shapes in geometry. A triangle with vertices A, B, and C is denoted
 theorem Trigonometric function Trigonometry of a tetrahedron Triangle also see List of triangle topics Sine, Cosine, Tangent trigonometric function
 found to be a mass of seaweed and driftwood tangled in an old buoy. Weather portal List of Bermuda Triangle incidents List of topics characterized as pseudoscience
 tools. List of mathematical shapes List of two  dimensional geometric shapes List of triangle topics List of circle topics List of curves List of surfaces
 an alphabetical index of articles related to curves. See also curve, list of curves, and list of differential geometry topics Acnode Algebraic curve
 This list of circle topics includes things related to the geometric shape, either abstractly, as in idealizations studied by geometers, or concretely
 an equilateral triangle is a triangle in which all three sides are equal. In the familiar Euclidean geometry, an equilateral triangle is also equiangular

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