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The word "triangle" came into use in Late Middle English directly from the Latin "triangulus" by dropping the Latin "us" ending. 

Triangulus is a compound word made of two Latin words.

Tri, is a prefix form of tres, which means three (3)Angulus, meaning corner.
a triangle has 3 sides because squares have already taken 4 sides. If u didn't know tri means 3, so that triangle has 3 sides. hope that helped

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