Golden Ratio φ (phi) mathematics

The golden ratio or golden number (also called God ‘s number, extreme and mean ratio) is an irrational number, represented by the Greek letter φ (phi) (lowercase) or Φ (Phi) (uppercase) after the Greek sculptor Phidias. It is an irrational number, unique solution of the equation x² = x + 1. It is approximately 1.61803398875.

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