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Ratio of Blue / Yellow = 1 : 1

Mathematical Proof

R₁ = 2.22222222222 = 20 / 9

Solution = 2.19615242271

Shaded Fraction = 400 / 841

Diameter = 4.58257569496

Blue Area = 4.75 = 19 / 4

Maximum Blue Area = 25

X = tangent BF = 15

Ratio of a / b = 0.75 = 3 / 4