Imagine:

A rectangle (a,b) as a billiard table.

A point with no dimensions as a billiard ball.

And that:

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: 6543856@gmail.com]

[Excuse me for my bad English]

- a friend helped me at first

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## Comments

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TopNewestNote that The ball rebinds exactly in it's previous path when it touches corners

How can I take a Figure here?

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How can I attach some pictures to this article?

Nima Nia

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