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Angle bisector theoremAltitudeIntersecting chords theoremIntercept theoremPythagorean theoremTriangle inequalityTangent-secant theoremTrigonometric functionsPythagorean additionLaw of cosinesPythagorean trigonometric identityApollonius's theoremPtolemy's theoremMorley's trisector theoremExterior angle theoremFundamental theorem of calculusLefschetz hyperplane theoremPerpendicular distanceSubtended angleSpherical law of cosinesHurewicz theoremTrigonometryTriangulationTrapezoidal ruleIsosceles trapezoidTangential angleLaw of sinesThales's theoremRight triangleEuler's theorem in geometryEuclidean distanceAngleTangent half-angle formulaMedianSpherical trigonometrySolution of trianglesHeron's formulaParallelogram lawHypotenuseTangential quadrilateralEuclidean plane isometryIsomorphism theoremsDistancePappus's centroid theoremNapoleon's theoremEllipseIntersection theoryFermat pointHilbert's nullstellensatzEuler lineMetric tensorHyperplane separation theoremLaw of tangentsIsometryGradient theoremRational root theoremPick's theoremEuler's theoremGeodesicStewart's theoremRiemannian geometrySemi-major and semi-minor axesDarboux's theoremGolden angleEuler's formulaSpiral of theodorusDivergence theoremMean value theoremSimons' formulaTriangle centerTrilinear coordinatesConic sectionDistance from a point to a planeEuclidean groupDirection cosineOutline of geometryLine segmentPtolemy's inequalityCoarea formulaIsosceles triangleTangent spaceDescriptive geometrySpecial right triangleRigid transformationBrahmagupta's formulaLagrange inversion theoremPolynomial remainder theoremPolar coordinate systemOsculating planeEuclidean topologyTangential and normal componentsEdgeCongruent numberClosed graph theoremGreen's theoremEuclidean minimum spanning treeCross-ratioSum of two squares theoremDistance from a point to a lineGeometric mean