Can you solve for the shaded areas? 3 great puzzles

Описание: These are 3 interesting questions. How many can you solve?

0:00 problems
2:35 solution 1
4:03 solution 2
6:15 solution 3

Problem 1 Math StackExchange
https://math.stackexchange.com/questi...

Problem 2 AoPS
https://artofproblemsolving.com/wiki/...

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