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Ratio of AD / BD = 7 / 4

Y Max = ϕ = 1.61803398875

AB = AC = 10.5830052443

Angle ADB = X = 45°

Ratio = 0.180339887499

tan COD = tan X = 7 / 24

3X = 45° ⇒ X = 15°

Line Segment CD = ???

Angle CFE = X = 25°

Ratio = 0.4472135955