Just uploaded to YouTube: This puzzle stumped a Math PhD student. But there is a clever way to solve it! by MindYourDecisions
https://youtu.be/iBMOxcDhLZU
https://youtu.be/iBMOxcDhLZU
YouTube
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…
Math StackExchange (see solution by Eric…