The problem book "Geometry 11th Grade" (Zadachnik) by E.V. Potoskuev and L.I. Zvavich is most commonly available in . While the companion textbook is often produced in hardcover , modern editions of the standalone problem book typically use a flexible soft binding. Product Specifications Binding Types :
: Primarily found when purchased as part of a 2-book "Textbook + Problem Book" set (e.g., the "Vertical" series from Drofa/Prosveshcheniye).
: Approximately 210 x 140 mm, with the softcover version weighing about 242 grams. Publisher : Usually published by Prosveshcheniye/Drofa .