Ancient civilizations primarily used the base 12 number system. It was perfect because it has factors of 2,3,4,6, and you can even combine together like 8 being 2/3rds of 12. This was the base of mathematics for a long time, and gave rise to concepts such as angles, measurements of time, and was ...

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 Sin(a)   Sin(b)   Sin(g)
------ = ------ = ------
  A        B        C


Where A, B, and C are the lengths of the sides of a triangle, and a, b, and g are the angles directly opposite those sides...


       /|
      /b|
   C /  |
    /   |A
   /    |
  /     |
 /a    g|
 --------
    B

... 
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