Angels are real spiritual beings created from light according to Islamic belief. Muslims believe in angels as the second fundamental belief. There are different types of angels named in the Quran and Hadith. Mathematics is the study of quantity, space, structure, and change. Mathematicians seek patterns and formulate new conjectures. There are several types of angles defined by their measure such as acute, right, obtuse, straight, and reflex angles. Angles can be labeled by name or by the letters at their vertex and arms.