# ⓘ List of triangle topics

## ⓘ 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