Keyword: «interactive textbook»

The article addresses the problem of developing spatial thinking in 10th–11th grade students studying stereometry and substantiates the use of interactive 3D models as a didactic tool. The author presents a developed interactive web-textbook on stereometry featuring six types of tasks with dynamic 3D models: figure rotation, parameter sliders, a cross-section construction trainer, tasks on the relative position of lines and planes, animation of solids of revolution formation, and quizzes with instant feedback. The results of a pedagogical experiment conducted in two parallel 10th-grade classes are described, demonstrating an improvement in the quality of solving stereometric problems in the experimental group.