If you are looking for more modern or specialized supplements, the author also wrote:
: Gabriel Velasco Sotomayor (1924–2008) was a distinguished Mexican mathematician who earned his PhD from the University of Paris and taught at prestigious institutions like UNAM and IPN. Availability and Formats Tratado De Geometria Gabriel Velasco Sotomayor Pdf
Obtuvo su doctorado en matemáticas en la Universidad de París en 1954. If you are looking for more modern or
Websites claiming to offer free PDF downloads for "Tratado de Geometría Velasco Sotomayor" often pose risks. Be cautious of: it is a serious treatise.
Yes, particularly for advanced 9th to 12th graders. For beginners, start with Book I (Plane Geometry) and move slowly. It is not a "light" read; it is a serious treatise.