I was working on a problem in which you were given three points, (0,2) , (2,3) ,and (4,5) which lie on the circumference of a circle and you had to find t in the point (0,t). the three points give you two chords. The perpendicular bisectors of the two chords give you the center of the circle which gives you the radius from which you can calculate the t in (0,t). Anyway, the reason for this note is that I accidentally hit something on my keyboard and lost the problem and now I can't find it. This has happened to me before. Is there documentation explaining how to navigate the site?