If ABCD and $A_1B_1C_1D_1$ are two similar rectangles (mean $AB:AD=A_1B_1:A_1D_1)$, then
Red=Yellow <=> $area(AA_1B_1B)+area(CC_1D_1D)=area(AA_1D_1D)+area(CC_1B_1B)$
I found this result when I research the British flag theorem.
Red=Yellow <=> $area(AA_1B_1B)+area(CC_1D_1D)=area(AA_1D_1D)+area(CC_1B_1B)$
I found this result when I research the British flag theorem.
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