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R₁ / ( R₂ + R₃ ) = ½ = 0.5

Without Regression !

Angle CGF = X = 72°

CD = X = 64 / 5 = 12.8

Angle ABC = θ = 20°

Mauve - Red = 0.785398163397

tan α + tan β = 1.17532019085

3 Blue = Green ⇒ Orange = ?

Angle ADC = X = 18°

Green Area = 3

X = 2 ( n + 1 )