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This article is about the basic geometric shape. For other uses, see Triangle (disambiguation).
Triangle illustration.svg
A triangle
Edges and vertices 3
Schläfli symbol {3} (for equilateral)
Area various methods;
see below
Internal angle (degrees) 60° (for equilateral)
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 \triangle ABC.

In Euclidean geometry any three points, when non-collinear, determine a unique triangle and a unique plane (i.e. a two-dimensional Euclidean space). This article is about triangles in Euclidean geometry except

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