Geometry

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Euclidean geometry Solid geometry Analytic geometry Trigonometry Transformational geometry Non euclidean geometry Projective geometry Differential geometry Riemannian geometry Algebraic geometry Fractal geometry Symplectic geometry Metric geometry Triangle geometry Conic sections Circle geometry Polygons Geometric measurement Spherical geometry Curves Polyhedra Tessellations Coordinate systems Vector geometry Hyperbolic geometry Inversive geometry Surfaces Algebraic curves Singularity theory Symmetry Complex geometry Algebraic surfaces Polytopes Lie theory geometry Computational geometry Characteristic classes Intersection theory Contact geometry Hodge theory Sheaf theory Affine geometry Moduli spaces Scheme theory Birational geometry Toric geometry Finite geometry Descriptive geometry E core Angle Function prefixes Differential geometry nlab Algebraic geometry nlab Geometers Geometry in biology Geometry problems History of geometry Geometric objects Theorems in differential geometry Connection Finsler geometry General relativity Smooth functions Smooth manifolds Theorems in projective geometry Named curves Named surfaces Named shapes Msc 14 algebraic geometry Msc 53 differential geometry

Probability & Statistics LicenceExplication9 min

Pourquoi les triangles aléatoires attrapent le centre du cercle une fois sur quatre

Placez trois points au hasard sur un cercle et le triangle contient le centre exactement une fois sur quatre. Deux preuves : une moyenne honnête, puis deux pièces déguisées en géométrie.