Geometry is the branch of mathematics that is concerned with spatial concepts such as size, shape and location. The relationship between points, lines and circles is at the core of geometry, and terms that are often used in this type of math include radius, diameter, angle and segment.
Learn more about geometry by watching these academic videos that are designed to illuminate the core concepts of this branch of mathematics. When you have completed them you will have a good understanding of the terminology and scope of this field.