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Intermediate

Blocking the entrance

Four squares are placed as shown. What is the yellow area?

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Solution

The yellow area is 2.

Solution by yifs.

ΔABCarea=ΔADCarea
YellowArea=ADEFarea=2×1^2=2

More solutions: https://x.com/Mirangu1/status/1874746431120286167

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