A rectangle (a,b) as a billiard table.
A point with no dimensions as a billiard ball.
Ball behaves as a light beam does in light reflection laws. We want to find that:
When(for which position af ball and which angles of starting shot) we can expect that ball has repetitious path after a while?
[I created it myself. I solved it before● but I'd like to see your solutions.]
[If you need some hints plz email me: firstname.lastname@example.org]
[Excuse me for my bad English]