ty (Perpendicular)ParallelVertexCongruenceSimilaritySymmetryZero-dimensionalPointOne-dimensionalLinesegmentrayLengthTwo-dimensionalPlaneAreaPolygonTriangleAltitudeHypotenusePythagorean theoremParallelogramSquareRectangleRhombusRhomboidQuadrilateralTrapezoidKiteCircleDiameterCircumferenceAreaThree-dimensionalVolumeCubecuboidCylinderPyramidSphereFour- / other-dimensionalTesseractHypersphereGeometersby nameAidaAryabhataAhmesAlhazenApolloniusArchimedesAtiyahBaudhayanaBolyaiBrahmaguptaCartanCoxeterDescartesEuclidEulerGaussGromovHilbertJyeṣṭhadevaKātyāyanaKhayyámKleinLobachevskyManavaMinkowskiMinggatuPascalPythagorasParameshvaraPoincaréRiemannSakabeSijzial-TusiVeblenVirasenaYang Huial-YasaminZhangList of geometersby periodBCEAhmesBaudhayanaManavaPythagorasEuclidArchimedesApollonius1–1400sZhangKātyāyanaAryabhataBrahmaguptaVirasenaAlhazenSijziKhayyámal-Yasaminal-Tusi