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Ray in a Square

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side length
3
4
5
6
7
new question
What is the
ratio CD/5?
0
A ray enters a square at point
A
, reflects off the top and bottom of the square, and leaves at point
B
with integer coordinates. What is the ratio
|CD|/d
, where
d=1,2,…,7
is the length of the side of the square?
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