diff --git a/EGkCurveComposite.h b/EGkCurveComposite.h
index 35fd3c7..fcea436 100644
--- a/EGkCurveComposite.h
+++ b/EGkCurveComposite.h
@@ -49,6 +49,7 @@ class __declspec( novtable) ICurveComposite : public ICurve
       virtual bool ArcsBezierCurvesToArcsPerpExtr( double dLinTol, double dAngTolDeg) = 0 ;
       virtual bool MergeCurves( double dLinTol, double dAngTolDeg, bool bStartEnd = true) = 0 ;
       virtual bool RemoveUndercutOnY( double dLinTol, double dAngTolDeg) = 0 ;
+      virtual bool IsACircle( double dLinTol, Point3d& ptCen, Vector3d& vtN, double& dRad, bool& bCCW) const = 0 ;
 } ;
 
 //-----------------------------------------------------------------------------
diff --git a/EgtNumUtils.h b/EgtNumUtils.h
index e63169c..08634db 100644
--- a/EgtNumUtils.h
+++ b/EgtNumUtils.h
@@ -26,3 +26,11 @@ double Clamp( double dVal, double dMin, double dMax)
 {
    return ( dVal <= dMin ? dMin : dVal >= dMax ? dMax : dVal) ;
 }
+
+//----------------------------------------------------------------------------
+inline
+bool IsEven( int nVal)
+{
+   return ( ( nVal % 2) == 0) ;
+}
+