"Entertaining geometry" is written both for friends of mathematics, and for those readers from whom for some reason many attractive aspects of mathematics have been hidden........ This book is intended for those readers..... [ who have learned (or are now learning) geometry only from the classroom board and therefore are not accustomed to notice the familiar geometric relationships in the world of things and phenomena around us , , , [ have not learned to use the acquired geometric knowledge in practice , in difficult cases of life , in the camping or front-line environment. To arouse the reader’s interest in geometry or, in the words of the author, “to inspire hunting and to cultivate a taste for its study is the direct task of this book.”