section_path: Role and characterizations in mathematics
section_name: Role and characterizations in mathematics
paragraph_text: Role and characterizations in mathematics
  
  Because π is closely related to the circle, it is found in many formulae from the fields of geometry and trigonometry, particularly those concerning circles, spheres, or ellipses. Other branches of science, such as statistics, physics, Fourier analysis, and number theory, also include π in some of their important formulae.