The book "Geometry for the 9th grade of secondary school" by the authors of the Boltyansky V. G. and Yagloma I. M. is an indispensable tool for students seeking to deepen their knowledge in the field of geometry. This edition is not just a textbook, but a real find for those who want not only to master the school curriculum, but also to develop logical thinking, spatial perception and analytical abilities. The book focuses on key topics of geometry that cover both theoretical and practical aspects. The authors offer readers a fascinating journey through the world of figures, angles and spatial bodies, with each section imbued with clear explanations and illustrative illustrations. This allows students not only to memorize formulas, but also to understand how they are applied in real life. The book includes many tasks of varying complexity, which makes it suitable for both students seeking a deep understanding of the subject and for those who just want to prepare for test papers and exams. “Geometry for the 9th grade of secondary school” will be interesting not only for schoolchildren, but also for their parents who want to help their children in their studies. Teachers will also find in this manual useful materials for preparing lessons and additional tasks. The book is suitable for adolescents aged 14 to 16 years, as well as for anyone interested in mathematics and wants to improve their skills in this area. The topics raised in the book cover a wide range of topics, from the properties of triangles and quadrilaterals to the study of circles and volumes of bodies. The authors focus on the importance of geometry in everyday life, showing how geometric principles are applied in architecture, art, and even in nature. This makes the material more lively and interesting, which contributes to better assimilation. The style of Boltyansky and Yaglom is characterized by accessibility and clarity. They skillfully combine theory with practical tasks, which allows readers not only to study the material, but also to apply it in practice. Their previous works, such as "Algebra for Grade 9" and "Mathematics for Grade 7", also received recognition for their methodicalness and accessibility, which confirms the high level of their pedagogical skills. The book “Geometry for the 9th grade of high school” will be an excellent assistant for anyone who wants not only to pass the exams, but also to love mathematics. It will help develop critical thinking, teach how to analyze and solve problems, and open doors to the world of scientific knowledge. Readers who are looking for additional material on geometry may also pay attention to books such as "Geometry. 9th Grade . Textbook" or "Geometry. Tasks and solutions” that will help to better understand the subject and prepare for future challenges . Do not miss the opportunity to take a step towards new knowledge and discover the fascinating world of geometry with this wonderful guide!