Morley's trisector theorem

# Theorems about triangles

Exterior angle theorem

Apollonius's theorem

Angle bisector theorem

In geometry, the angle bisector theorem is concerned with the relative lengths of the two segments that a triangle's side is divided into by a line that bisects the opposite angle. It equates their relative lengths to the relative lengths of the other two sides of the triangle.

Ver teoremaHinge theorem

Hinge theorem In geometry, the hinge theorem (sometimes called the open mouth…

Ver teoremaNapoleon's theorem

Napoleon's theorem Napoleon's theorem: If the triangles centered on L, M, and…

Ver teoremaCeva's theorem

Ceva's theorem For other uses, see Ceva (disambiguation). Ceva's theorem, case 1:…

Ver teoremaDesargues's theorem

Desargues's theorem Perspective triangles. Corresponding sides of the triangles, when extended, meet…

Ver teoremaStewart's theorem

Stewart's theorem In geometry, Stewart's theorem yields a relation between the lengths…

Ver teoremaApollonius's theorem

Apollonius's theorem This article is about the lengths of the sides of…

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