Now we are looking on the crossword clue for: Twenty-first letter of the Greek alphabet.
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Possible Answers:
PHI.
Last seen on: Irish Times Simplex – Aug 13 2019
Random information on the term “PHI”:
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. The figure on the right illustrates the geometric relationship. Expressed algebraically, for quantities a and b with a > b > 0,
where the Greek letter phi ( φ {\displaystyle \varphi } or ϕ {\displaystyle \phi } ) represents the golden ratio.[a] It is an irrational number that is a solution to the quadratic equation x 2 − x − 1 = 0 {\displaystyle x^{2}-x-1=0} , with a value of:
The golden ratio is also called the golden mean or golden section (Latin: sectio aurea). Other names include extreme and mean ratio, medial section, divine proportion, divine section (Latin: sectio divina), golden proportion, golden cut, and golden number.