override this.ToString () =
$"{{{nameof Ellipse}: {nameof this.Cx} = %f{this.Cx}, {nameof this.Cy} = %f{this.Cy}, {nameof this.A} = %f{this.A}, {nameof this.B} = %f{this.B}, {nameof this.Alpha} = %f{this.Alpha}}}"
override this.ToString () =
$"{{{nameof Ellipse}: {nameof this.Cx} = %f{this.Cx}, {nameof this.Cy} = %f{this.Cy}, {nameof this.A} = %f{this.A}, {nameof this.B} = %f{this.B}, {nameof this.Alpha} = %f{this.Alpha}}}"