Stronger forms of the Steiner-Lehmus theorem - Mowaffaq Hajja We give a short proof based on Breusch's lemma of a stronger form of the...
Another variation of the Steiner-Lehmus theme - Sadi Abu-Saymeh, Mowaffaq Hajja, and Hassan Ali ShahAli Let the internal angle bisectors BB' and...
A condition for a circumscriptible quadrilateral to be cyclic - Mowaffaq Hajja We give a short proof of a characterization, given by M. Radic et...
A short trigonometric proof of the Steiner-Lehmus theorem - Mowaffaq Hajja We give a short trigonometric proof of the Steiner-Lehmus theorem....
Coincidence of centers for scalene triangles - Sadi Abu-Saymeh and Mowaffaq Hajja A center function is a function Z that assigns to every...
A very short and simple proof of ``the most elementary theorem" of euclidean geometry - Mowaffaq Hajja We give a very short and simple proof of...
A characterization of the centroid using June Lester's shape function - Mowaffaq Hajja and Margarita Spirova The notion of triangle shape is used...
Some Brocard-like points of a triangle - Sadi Abu-Saymeh and Mowaffaq Hajja In this note, we prove that for every triangle ABC, there exists a...
Triangle centers with linear intercepts and linear subangles - Sadi Abu-Saymeh and Mowaffaq Hajja Let ABC be a triangle with side-lengths a, b,...
