Thanks to Reio in Romania for emailing me this fun problem! What is the area? This puzzle was shared with the tagline “you should be able to solve this.”

Solution to 5th grade Chinese challenge problem
https://youtu.be/OuJQaxZvlYs

My blog post for this video
https://wp.me/p6aMk-82G

Reference
Math problem from anime Steins;Gate
https://math.stackexchange.com/questions/798367/area-of-a-part-of-a-square

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