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Distance

Cosmin
Cosmin Negruseri
08 octombrie 2013

Here's a neat problem I solved in 8th grade during the preparation for the high school entrance exam:

Let A~1~B~1~C~1~D~1~A~2~B~2~C~2~D~2~ be a cube with A~1~B~1~C~1~D~1~ being the bottom face and A~2~B~2~C~2~D~2~ the four corners of the top face. Given that A~1~A~2~ is of length 1 what's the distance between D~2~A~1~ and A~2~B~1~.

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