Задача о Брахистохрона

The problem of Brachistochron is the task of finding the curve of the speediest descent from the mountain. An application with elements of augmented reality implements a demo model of this task. The application works ONLY together with special markers presented in the form of a poster and flyer (can be downloaded from the link below). The appendix presents three options for descent, one of which demonstrates the solution to this problem. Also in the application there is a demonstration of an interesting feature of cycloids - solutions to this problem.

Link to download the flyer:
https://drive.google.com/open?id=13moPebZHiWM5kx4vTksUBey40ZkJuTzc