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OpenStudy (anonymous):
whats the length of CD
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OpenStudy (anonymous):
a regular CD or mini-disk?
OpenStudy (anonymous):
OpenStudy (anonymous):
Oh.. That CD ... :p use the similarity of triangles rule if 5 => 20 then x => (20-x) 5*(20-x) = 20x 5*20 - 5x = 20x 5*20 = 25x 20 = 5x 4 = x
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