Hexagram: Star Figure, Equilateral, Triangle (geometry), Root System, Mathematics

Cupola (geometry): Geometry, Polygon, Equilateral Triangle

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

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

Napoleon's Theorem: Mathematics, Equilateral Triangle, Centroid,