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Orange Area = 11.6913429511

Shaded Area = 40

Angle ADM = 45°

Shaded Fraction = 2 / 5 = 0.4

ACB = BDC = β = 45°

x = my² - by + c ( by regression )

X = ± 0.786151381092

X / Y = 1.41421356236

R₁ / R₂ = 658918622598

Angle BOC = 120°