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

Ono's Inequality: Mathematics, Theorem, Triangle, Euclidean Plane

Hjelmslev's Theorem: Geometry, Euclidean Plane Isometry, Parallel Postulate

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

Carnot's Theorem: Euclidean Geometry, Lazare Carnot, Triangle, Signed Distance