The Compendium Geometry is an eBook providing facts, formulas and explanations about geometry.

Properties of Arbitrary Triangles

The following formulas are valid for any triangle. Please note that there are simpler formulas for special triangles such as a right triangle.

Known properties Properties to calculate Area A
three sides known:
a, b, c


two sides and one angle are known:
a, b, γ


two sides and one angle are known:
a, b, α


two sides and one angle are known:
a, b, β


two angles and one side are known:
α, β, a


two angles and one side are known:
α, β, c



Last Update: 2011-01-11