Perhaps the strongest section of the book, it explains Thales' Theorem and triangle similarity in a way that makes complex ratios easy to understand.
Geometría by Ximena Carreño and Ximena Cruz is a widely used Chilean textbook covering fundamental Euclidean geometry, including polygons, circles, and 3D solids. It features a structured approach with theoretical summaries, solved exercises, and practice questions designed for high school and university preparation. Access the textbook's prologue and materials on Carreno Geometria 1e Prologo | PDF | Geometría - Scribd geometria ximena carreno pdf