Geometry of billiard trajectories in polygons

The book outlines the results of the study of the authors of the geometry of billiard trajectories in the corners and polygons. In the study, the authors enjoy the definition of a billiard trajectory introduced by them. The device is systematically used isometric plane transformations. This allows them to establish the features of billiard trajectories, methods for their construction, calculate the lengths (perimeters) of closed trajectories.
The book on the geometry of billiard trajectories in the corners and polygons can be a useful wide circle of readers - lovers of mathematics and physics. First of all, it is designed for readers interested in elementary geometry. In the presence of help from a teacher of mathematics, a book can be accessible to reading secondary school students.
The geometric type of billiard trajectories (closed and unlocked) in various polygons may be interested in billiards