RhinoCommon API
CurveTryGetArc Method (Plane, Arc, Double) | 
            Try to convert this curve into an Arc using a custom tolerance.
            
Namespace: Rhino.Geometry
Assembly: RhinoCommon (in RhinoCommon.dll)
public bool TryGetArc( Plane plane, out Arc arc, double tolerance )
Public Function TryGetArc ( plane As Plane, <OutAttribute> ByRef arc As Arc, tolerance As Double ) As Boolean
Parameters
- plane
 - Type: Rhino.GeometryPlane
Plane in which the comparison is performed. - arc
 - Type: Rhino.GeometryArc
On success, the Arc will be filled in. - tolerance
 - Type: SystemDouble
Tolerance to use when checking. 
Return Value
Type: Booleantrue if the curve could be converted into an arc within the given plane.