A strengthened version of the Erdos-Mordell inequality - Dao Thanh Oai, Nguyen Tien Dung and Pham Ngoc Mai We present a strengthened version of...
Some golden sections in the equilateral and right isosceles triangles - Dao Thanh Oai Associated with the equilateral triangle and the right...
Equilateral triangles and Kiepert perspectors in complex numbers - Dao Thanh Oai We construct two equilateral triangles associated with an...
Two pairs of Archimedean circles in the arbelos - Dao Thanh Oai We construct four circles congruent to the Archimedean twin circles in the...
A simple proof of Gibert's generalization of the Lester circle theorem - Dao Thanh Oai We give a simple proof of Gibert's generalization of the...
