(i) Zero Angle: If the initial and final positions of a ray coincide without any rotation, the angle formed is zero angle. (ii) Right Angle: If the final position of the ray is one fourth of the complete revolution, the angle between the initial and final positions is called right angle. (iii) Straight Angle: Let OA represents initial position of a ray and 0 B repres... https://www.expertsmind.com/course-help/?p=types-of-angles-98734287229