EntityQ4582901· pop 11· linked from 127 articlesincidence geometrySign in to savethe mathematical study of incidence structuresConnectionsparallelogramEntityplaneEntityHarold Scott MacDonald CoxeterEntitySylvester–Gallai theoremEntitymathematicsEntityRené DescartesEntityArchimedesEntitygeometryEntityPythagorasEntityEuclidEntityCarl Friedrich GaussEntityBlaise PascalEntityLeonhard EulerEntitytriangleEntityareaEntityInternational Standard Book NumberEntityOmar KhayyámEntityDavid HilbertEntitycircleEntityangleEntityCategoriesIncidence geometry