CPCTC: Geometry, Theorem, Congruence (geometry), Triangle

Apollonius' Theorem: Geometry, Theorem, Median (geometry), Triangle

SSS Postulate: Geometry, Postulate, Triangle, Congruence (geometry)

Congruence (geometry): Geometry, Point (geometry), Isometry, Translation (geometry)

Defect (geometry): Geometry, Hyperbolic Triangle, Spherical Gauss Bonnet Theorem