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The textbook corresponds to the geometry curriculum for the 8th grade of secondary schools (classes) with in-depth study of mathematics. The material is presented at a high scientific and methodological level. The textbook contains extensive and varied didactic material. All tasks are differentiated by the level of difficulty, which gives the teacher the opportunity to implement an individual approach to students. The textbook contains a sufficient number of illustrations and stories about prominent mathematicians. The section "Making friends with the computer" contains a list of tasks that can be performed using a computer.