What is the area of the red stripes?

This is a brilliantly fun geometry problem!

0:00 problem
1:00 similar triangles
3:00 solution

References
Similar triangles area (Math StackExchange)
https://math.stackexchange.com/questi...

Euclid similar triangles (book of proofs)
https://www.bookofproofs.org/branches...

Euclid similar triangles (Clark University)
https://mathcs.clarku.edu/~djoyce/jav...

Triangle problem on Scholr
https://www.scholr.com/community/ques...

Triangle problem on Quora
https://www.quora.com/A-triangle-is-d...

Triangle problem on Purple Comet! Math Meet April 2018 (problem 10)
https://purplecomet.org/views/data/20...

Triangle problem on Brilliant (google webcache)
https://webcache.googleusercontent.co...

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