An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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rule of three
  رزن ِ سه  
razan-e sé
Fr.: règle de trois  

Te method of finding the fourth term in a proportion when three terms are given.

See also: → rule; → three.