The Compendium Geometry is an eBook providing facts, formulas and explanations about geometry. 
Home Analytic Geometry Triangle Triangle  General Definitions  
See also: Construction of a Triangle, Equilateral Triangle, Isosceles Triangle, Properties of a Right Triangle, Trapezoid, Quadrilateral  General Definitions, Regular Polygon  
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Triangle  General DefinitionsA triangle is a polygon which consists of three sides (sometimes also called a trigon). Normally the vertices of the triangle are labeled counterclockwise by the uppercase letters A, B, and C. Each vertex has a vertex angle which is labeled by the corresponding greek letter, α, β, γ, respectively. The sides of the triangle are labeled by lowercase letters, corresponding to the particular opposite vertex.
There are several special triangles: acute triangle, obtuse triangle, equilateral triangle, isosceles triangle, right triangle, and isosceles right triangle.


Home Analytic Geometry Triangle Triangle  General Definitions 