Who is the father of Geometry?
Euclid wrote a series of books around 500 B.C. defining axiomatic geometry (now often called synthetic geometry) where, based on a few axioms (self-evident truths), properties of lines, triangles, polygons and such were deduced (proved by logical reasoning). These books (although some have been lost) have been reprinted; rewritten and reedited more times it has been claimed than the Bible. Therefore Euclid is considered 'Father of Geometry'.