Morley's Trisector Theorem: Plane Geometry, Triangle, Equilateral Triangle

Lester's Theorem: Euclidean Plane, Geometry, Scalene Triangle

Equilateral Triangle: Geometry, Triangle (geometry), Euclidean Equiangular Polygon

Cupola (geometry): Geometry, Polygon, Equilateral Triangle

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