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Nobody learns solid geometry by reading about it. You draw the figure. You turn it in your head. Then you prove what you claim to see — 838 times, in this book. Kvasnikova’s Collection of Problems in Geometry: Stereometry is one graded sequence. Problem 1 to problem 838, no breaks. 33 sections. Each opens with questions you answer in your head. Each closes with multi-step constructions and computations. The difficulty climbs inside every topic — not only across the book. Lines and planes. Projections. Dihedral and polyhedral angles. Prisms, pyramids, the regular polyhedra. Cylinders, cones, spheres. Inscribed and circumscribed solids. Five sections end with practical work. Measure it. Build the model. Sections through beams, pontoons, quantities of material. 54 figures, each beside its problem. An answer key. The proofs are left to you — that is the point. 142 pages. Pairs with Kiselev’s Stereometry and Rybkin’s Part II. First faithful English translation from the original Russian edition. russianmathbooks.com/books/k… #Mathematics