A theorem on orthology centers - Eric Danneels and Nikolaos Dergiades We prove that if two triangles are orthologic, their orthology centers have...
Signed distances and the Erdos-Mordell inequality - Nikolaos Dergiades Using signed distances from the sides of a triangle we prove an inequality...
Antiparallels and concurrency of Euler lines - Nikolaos Dergiades and Paul Yiu We study the condition for concurrency of the Euler lines of the...
Rectangles attached to the sides of a triangle - Nikolaos Dergiades and Floor van Lamoen We study the figure of a triangle with a rectangle...
Harcourt's theorem - Nikolaos Dergiades and Juan Carlos Salazar We give a proof of Harcourt's theorem that if the signed distances from the...
The Gergonne problem - Nikolaos Dergiades LTTK TEZ xin giới thiệu với bạn đọc yêu thích tạp chí Hình học Geometricorum một bài viết cực chất với...
