圆锥曲线命令 Axes Center Circle Circumference Coefficients Conic ConjugateDiameter Curvature Directrix Eccentricity Ellipse Focus Hyperbola Incircle LinearEccentricity MajorAxis Midpoint MinorAxis OsculatingCircle Parabola Parameter PathParameter Perimeter Polar Radius Sector SemiMajorAxisLength SemiMinorAxisLength Semicircle Tangent Type Vertex 另请参阅 Conic_Section_Tools .