Triangle

Law of Sines

Law of Cosines

Law of Tangents

Also,
where

Altitude

The altitude of a triangle is the line segment from one vertex that is perpendicular to the opposite side.

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.

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Subjects: Geometry