EntityQ7682880· pop 10· linked from 14 articlestangential angleSign in to saveangle between the tangent line to the curve at the given point and the x-axisConnectionsgeometryEntityInternational Standard Book NumberEntityvelocityEntityderivativeEntityspeedEntitycurveEntitypolar coordinate systemEntitytangentEntitygraph of a functionEntitycurvatureEntitylogarithmic spiralEntityMathWorldEntityarc lengthEntityparametric equationEntityEric W. WeissteinEntityprimeEntityPlanetMathEntityCiteSeerXEntityFrenet–Serret formulasEntitydifferential geometry of curvesEntityCategoriesAnalytic geometryDifferential geometry