"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 yet accustomed to notice the familiar geometric relationships in the world of things and phenomena around us , , , [ did not learn to use acquired geometric knowledge in practice in difficult cases of life , in a camping or bivouac setting. 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.” ..