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Triangle

Law of Sines

Law of Cosines

Law of Tangents

Also,
where

See also: Altitude of a Triangle, Cevian, Equilateral Triangle, Gergonne Point, Heronian Triangle, Isogonal Conjugate, Isosceles Triangle, Malfatti Circles, Medial Triangle, Nagel Point, Orthic Triangle, Orthocentre, Pedal Triangle, Primitive Pythagorean Triangle, Pythagoras Theorem, Pythagorean Triangle, Right Triangle, Spherical Triangles, Symmedian, Trigon.

Subjects: Geometry