You are searching for "GDZ" solutions for the Russian 10-11 grade "Geometriya" textbook, specifically regarding solid geometry or stereometry topics like prisms and cones. These materials often feature answers for popular authors such as Atanasyan or Pogorelov. You can find these resources by searching for the author's name and "GDZ" on platforms like Gdz.ru, Reshak.ru, or Megaresheba.ru. Focusing on core concepts like volume formulas and cross-sections is key for mastering these topics.