Books 11-13 deal with solid geometry. This set of books is remarkably clear and easy to understand. Theorems are stated, then they are proved. Euclid actually made few discoveries. He did make a few, but very minute ones. He is credited with developing many ideas, but first and foremost, he is understood to have been one of the greatest thinkers of all time. Euclid and His Accomplishments Euclid s story, although well known, is also something of a mystery. The most prolonged argument over time has been that of the parallel postulate which states: there can only be one line that contains a given point and is parallel to another line. Although Euclid is a famous mathematician, very little is known about his life. It is believed that he was a student of Plato. Euclid was born around 365 B.C. in Alexandria, Egypt and lived until about 300 B.C. Euclid As the Father of Geometry. A common misconception is that Euclid invented all concepts of geometry. This is certainly not so, as he really only pulled together ideas and developed them as his own within a textbook.
He was in no way documented biographically, at least in terms of detail and depth. He was mentioned by several other Greek thinkers, such as Pappas of. Alexandria. Praclus is also known to have written about him.