While Chen’s book is more comprehensive and modern, Andreescu’s "106 Problems" is often seen as a better intermediate workbook . It provides a high density of high-quality problems without the 400-page commitment of a full-scale encyclopedia. How to Study Effectively
The bread and butter of Olympiad geometry.
Mastering Menelaus, Ceva, and Desargues' Theorem.
Is the "106 Geometry Problems PDF" Better Than Other Resources?
When compared to "Geometry Revisited" (Coxeter) or "Euclidean Geometry in Mathematical Olympiads" (Chen), Andreescu’s book occupies a unique niche: