In-plane geometry, an angle is the figure formed by two rays, called the sides of the angle, sharing a common endpoint, called the vertex of the angle. Angles formed by two rays lie in a plane, but this plane does not have to be a Euclidean plane. The various types of angles which are explained in this chapter are straight angle, complete angle, zero angles, right angle and an obtuse angle. It includes fundamental geometrical concepts like Angles, classification of angles and adjacent angles. The applications of angles in our daily lives are in designs, buildings, roads, sporting facilities, bridges etc.