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( Triangle (geometry))
A triangle is one of the basic shapes of geometry a polygon with three corners or vertices and three sides or edges which are line segments. A triangle with vertices A, B, and C is denoted  ABC. In Euclidean geometry any three non-collinear points determine a unique triangle and a unique plane (i.e. a two-dimensional Euclidean space). Triangles can be classified according to the relative lengths of their sides Triangles can also be classified according to their internal angles, described below using degrees of arc
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Triangle (geometry) Subcategories
Triangle (geometry) Articles
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