fibonacci 1

In mathematics, two quantities are in the golden ratio if their ratio is the same as the ratio of their sum to the larger of the two quantities. Remember, a ratio is a fraction. Opposite are two segments, labeled a and b. The equation shows how the golden ratio works.

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φ
The golden ratio is approximately equal to 1.618 and is symbolized by the Greek letter phi as shown above. The number appears many times in geometry, art, and architecture: the Parthenon shows signs of the golden ratio. The number even shows up in describing the perfectly proportioned human body and face.