Basic Geometry : segments, rays, lines, triangles Dear friends, this book presents the most basic knowledge of geometry. If you are a student, the book is a very useful reference for you to study and test. Each flat shape is a set of points of the plane. In this book, we are seeing some flat shapes like segments, rays, lines, triangles. At the end of each chapter there are exercises that have the solution, before you read the solution, you should solve the exercises yourself first. Wish you study and learn well