What exactly is the Golden Ratio in maths?

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What exactly is the Golden Ratio in maths?

In: Mathematics

It is approximately 1.618.

Or, it is the ratio between any two values a and b such that a>b and a/b = (a+b)/a.

It has interesting mathematical properties, especially in geometry. It appears sometimes in nature and is considered to be visually appealing in art and architecture. Printer paper, playing cards, and light switch plates are all approximately golden rectangles. Its appearance in nature does tend to be overexaggerated, however.