This paper deals with an unannounced theorem by Frank Morley that he originally published amid a collection of other, more general, theorems. Having intrigued mathematicians for the past century, it is now simply referred to as Morley’s trisector theorem:
The three intersections of the angles of a triangle, lying near the three sides respectively, form an equilateral triangle.
"The Morley Trisector Theorem,"
The Mathematics Enthusiast: Vol. 1
, Article 3.
Available at: https://scholarworks.umt.edu/tme/vol1/iss2/3