Math

This shadow problem takes math to a new dimension!

What is the height of the red bar? This puzzle was posted on Math StackExchange by a Math PhD candidate, so I did not feel bad when I was unable to solve it! (Though I suspect some people will even find it “easy.”)

Math StackExchange (see solution by Eric Duminil). It was posted by a Math PhD student
https://math.stackexchange.com/questions/2471016/find-the-height-of-a-bar-given-the-lengths-of-shadows-cast-by-it-and-another-ba

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