Golden sections in a regular hexagon - Quang Tuan Bui We relate a golden section associated with a regular hexagon to two recent simple...
A triad of similar triangles associated with the perpendicular bisectors of the sides of a triangle - Quang Tuan Bui We prove some perspectivity...
Two more Powerian pairs in the arbelos - Quang Tuan Bui We construct two more pairs of Archimedes circles analogous to those of Frank Power, in...
Two triads of congruent circles from reflections - Quang Tuan Bui Given a triangle, we construct two triads of congruent circles through the...
The arbelos and nine-point circles - Quang Tuan Bui We construct some new Archimedean circles in an arbelos in connection with the nine-point...
Pedals on circumradii and the Jerabek center - Quang Tuan Bui Given a triangle ABC, beginning with the orthogonal projections of the vertices on...
