public Nullable<double> TangentDirection {get; set;}

// define with a radius, arcLength and chord direction 
var circularArcDef = new CircularArcDefinition
{
  Radius = -201.0,
  ArcLength = 45.29,
  ChordDirection = ParcelUtilities.Instance.ConvertQuadrantBearingDMSToNorthAzimuthDecDeg("N21-47-57W")
};
var cogoCircArc = COGOLineBuilder.CreateCOGOCircularArc(circularArcDef);


// define with a radius, chordLength and tangent direction 
var circularArcDef2 = new CircularArcDefinition
{
  Radius = -201.0,
  ChordLength = 44.0,
  TangentDirection = 340.0
};
var cogoCircArc2 = COGOLineBuilder.CreateCOGOCircularArc(circularArcDef2);

// define with a radius, central angle and radial direction
var circularArcDef3 = new CircularArcDefinition
{
  Radius = -201.0,
  CentralAngle = 44.0,
  RadialDirection = 340.0
};
var cogoCircArc3 = COGOLineBuilder.CreateCOGOCircularArc(circularArcDef3);