Area of a circle

Concept in geometry Part of a series of articles on themathematical constant π 3.1415926535897932384626433... Uses Area of a circle Circumference Use in other formulae Properties Irrationality Transcendence Value Less than 22/7 Approximations Milü Madhava's correction term Memorization People Archimedes Liu Hui Zu Chongzhi Aryabhata Madhava Jamshid al-Kashi Ludolph van Ceulen François Viète Seki Takakazu Takebe Kenkō William Jones John Machin William Shanks Srinivasa Ramanujan John Wrench Chudnovsky brothers Yasumasa Kanada History Chronology A History of Pi In culture Indiana pi bill Pi Day Related topics Squaring the circle Basel problem Six nines in π Other topics related to π Tau vte GeometryProjecting a sphere to a plane Branches Euclidean Non-Euclidean Elliptic Spherical Hyperbolic Non-Archimedean geometry Projective Affine Synthetic Analytic Algebraic Arithmetic Diophantine Differential Riemannian Symplectic Discrete differential Complex Finite Discrete/Combinatorial Digital Convex Computational Fractal Incidence Noncommutative geometry Noncommutative algebraic geometry ConceptsFeaturesDimension Straightedge and compass constructions Angle Polytope Centroid Diagonal O