The book "Geometry 9-10" by the authors of Klopsky V. M. , Skopka Z. A. and Yagodovsky M . and . is an indispensable educational material for students studying geometry at the level of ninth and tenth grades . This textbook not only covers all the key topics necessary for successful mastering of the subject, but also does so in a fascinating and accessible form, which allows students to easily master even the most complex concepts. From the first pages of the book, the reader plunges into the world of geometry, where each theorem and rule are illustrated with vivid examples and visual drawings. The authors pay special attention to the practical application of geometric knowledge, which makes the material not only theoretically sound, but also useful in real life. For example, the book looks at problems related to architecture, art, and even nature, allowing students to see how geometry permeates all aspects of our existence. This book will be interesting not only for high school students, but also for their parents who want to help their children in learning mathematics. The textbook is suitable for self-study, and can also be used as a basic textbook in lessons. Thanks to the clear structure and logical presentation of the material, “Geometry 9-10” will be an excellent assistant for both those who are just beginning to get acquainted with geometry, and for those who already have some knowledge and want to deepen them. The topics raised in the book cover a wide range of geometric concepts: from the properties of figures and their relationships to more complex topics, such as trigonometry and analytical geometry. The authors not only explain how to solve problems, but also help to understand why these methods work, which is an important aspect for the formation of logical thinking in schoolchildren. In addition, the book presents a variety of exercises and tasks that contribute to the consolidation of knowledge and the development of analytical abilities. The style of the authors is clear and accessible. Klopsky V. M. , Skopets Z. A. and Yagodovsky M. and . are known for their teaching aids, which are popular among teachers and students. Their previous works, such as “Algebra 7-9” and “Mathematics for schoolchildren”, also received high marks for the quality and clarity of the presentation of the material. This makes them real experts in educational literature, and their new textbook is no exception. The book “Geometry 9-10” will be especially useful for those who are preparing for exams and want to feel confident in the control work. It will help not only to prepare for the tests, but also to develop interest in mathematics in general, which can become the basis for further study at the university. The textbook will be an excellent addition to other manuals in mathematics and geometry, and can also be used as a reference for solving problems. If you’re looking for a high-quality and fun geometry guide for high school students, “9-10 Geometry” is exactly what you need. This book will become a reliable companion in the world of geometric shapes and theorems, opening up new horizons of knowledge and possibilities for the reader. Do not miss the chance to make the study of geometry not only useful, but also interesting!