The book “Entertaining geometry in free air and at home” by Yakov Isaacovich Perelman is not just a textbook, but a real find for everyone who wants to look at the world of geometry from a new, fascinating side. Perelman, known for his vivid and accessible explanations of complex mathematical concepts, creates in this book an atmosphere in which geometry becomes a game rather than a boring subject. From the first pages, the reader is immersed in the world of amazing figures, spatial forms and entertaining tasks. The author masterfully combines theory with practice, offering readers not only to study geometric concepts, but also to apply them in everyday life. The book presents a variety of experiments and tasks that can be performed both on the street and at home. This makes it ideal for family reading, as well as for teachers who want to bring an element of play and creativity to math lessons. Who can like this book? First of all, it will be of interest to schoolchildren and their parents, as well as to anyone who wants to refresh their knowledge in the field of geometry . If you are looking for a way to make studying mathematics more fun and less formal, “Entertaining Geometry” will be an excellent choice. The book is suitable for both children of primary and secondary school age, and for adults who want to remember the basics of geometry and see how they are applied in real life. The topics raised in the book cover a wide range: from simple figures to complex spatial structures. Perelman touches on symmetry, proportions, and even some aspects of topology, focusing on how geometry surrounds us everywhere. Readers will be able to learn how with simple tools such as a ruler and a compass, you can create amazing shapes and solve interesting problems. This not only develops logical thinking, but also awakens a creative approach to solving problems. Perelman's style is characterized by simplicity and accessibility, which makes his books especially attractive to a wide audience. He skillfully uses vivid examples and illustrations that help the reader better understand the material. In addition, his work is full of humor and irony, which makes the reading process easy and enjoyable. Other well-known works of the author, such as "Entertaining Mathematics" and "Entertaining Physics", also differ in the same approach - a combination of serious science and fascinating presentation. The book “Entertaining geometry in the free air and at home” deserves attention not only for its educational aspect, but also for the opportunity to unite family and friends in a fascinating process. This is a great way to spend time together, solving problems and conducting experiments, as well as the opportunity to develop children's interest in mathematics and science in general. If you are looking for a book that will help you and your children to look at geometry from a new angle, make learning mathematics fascinating and accessible, then “Entertaining geometry in the open air and at home” is exactly what you need. Do not miss the chance to discover the world of geometry, which is full of wonders and amazing discoveries!