Golden Ratio Geometry
Hidden φ in a unit square · r = (√5 − 1) / 4 = 1 / 2φ
Unit square + diagonal
Line to midpoint of right side (√5/2)
Inscribed circle (r)
Construction lines
cos(a) = (√2/4) / (√5/2) = r / (√2 − √2r)
r · (5 + √5) = √5
r = (√5 − 1) / 4 ≈ 0.309
← Neuro
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