Description: Learn about geometry terms like point, line, and ray. We will also learn how to label them. Created by Sal Khan. And I guess the best place to start is even think about what geometry means, as you might recognize the first part of geometry right over here. So when you start learning about geometry, you learn about lines and triangles and circles. But it also encapsulates things like patterns and three-dimensional shapes.*Teacher Advisor is 100% free.