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Isosceles Triangle

Diameter AB = 2R = 9

Shaded Fraction = 1 / 4

R = 5 ⇒ Shaded Area = 16

EF = 12 ⇒ CF = X = 8

Ratio = ϕ = 1.61803398875

Ratio of AB / BC = 4 / 1

Shaded Fraction = 1 / 2 = 0.5

Radius R = 2.25

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