Nobody - 'tri' simply means three.
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pascal
There are a few mathematical triangles, the two that immediately spring to mind are Pascal's Triangle, named after Blaise Pascal, and the Sierpiński Triangle, named after Polish mathematician Wacław Sierpiński.
Blaise Pascal.
It was invented by a mathematician named Pascal.
That's life.Pascal's triangle is a geometric arrangement of the binomial coefficients in a triangle, named after the mathematician Blaise Pascal in much of the Western world, although other mathematicians studied it centuries before him in India, Persia, China, and Italy.In 1655, Blaise Pascal wrote a Traité du triangle arithmétique (Treatise on Arithmetical Triangle), in which he collected several results then known about the triangle, and employed them to solve problems in probability theory. The triangle was later named after Pascal by Pierre Raymond de Montmort (1708) and Abraham de Moivre (1730).