Unit 1 : Intro to the Euclidean Geometry Video-Euclid as the Father of Geometry Euclid was a great mathematician and often called the father of geometry.  Learn more about Euclid and how some of our math concepts came about and how influential they have become. Created by Sal Khan. 0:00 - "The laws of nature are but the mathematical thoughts of God. And this is a quote from Euclid of Alexandria" 0:37 - "Geo comes from Greek for 'Earth', Metry comes from Greek for 'Measure'"   Video- Terms & Labels in Geometry - CCSS Math: 4.G.A.1   Video- Lines, Line Segments, and Rays - CCSS Math: 4.G.A.1