Median (Geometry): Geometry, Triangle, Line segment, Vertex (geometry), Midpoint

Cevian: Geometry, Line Segment, Triangle, Vertex (geometry)

Symmedian: Geometry, Straight Line, Triangle (Geometry), Median (Geometry)

Cleaver (geometry): Geometry, Triangle, Line Segment, Bisect

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