This book is a structured and engaging guide for students beginning their journey into geometry. It uses visual examples and simple language to explore foundational geometric concepts, offering both theoretical explanations and practical exercises to build a solid mathematical understanding.

In this book we are going to study the basic concepts and principles of angles and triangles in Euclidean plane
geometry. Today we can describe geometry as the branch of mathematics which is concerned with the properties of
shapes and figures in the plane and in space, although the study of geometry is a very old practice that began
thousands of years ago.