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You're probably referring to Euclid, whose theories on geometry are still used today, hence "Euclidean Geometry". If it's not Euclid , Pythagoras was also quite well-known for maths, geometry and the like. You're probably referring to Euclid, whose theories on geometry are still used today, hence "Euclidean Geometry". If it's not Euclid , Pythagoras was also quite well-known for maths, geometry and the like.
Euclid wrote them
Euclid
Nothing is known of Euclid's personal life.
Pythagoras died before Euclid was born.