diff --git a/CurveComposite.cpp b/CurveComposite.cpp
index 823a89c..71bd653 100644
--- a/CurveComposite.cpp
+++ b/CurveComposite.cpp
@@ -267,7 +267,7 @@ CurveComposite::AddSimpleCurve( ICurve* pSmplCrv, bool bEndOrStart, double dLinT
 
   // imposto ricalcolo Voronoi
    ResetVoronoiObject() ;
-   return true ;
+   return Validate() ;
 }
 
 //----------------------------------------------------------------------------
@@ -856,6 +856,18 @@ CurveComposite::Validate( void)
       m_nStatus = ( nCount > 0 ? OK : TO_VERIFY) ;
    }
 
+  // verifico chiusura
+   if ( IsClosed()) {     
+      Point3d ptStart ; m_CrvSmplS.front()->GetStartPoint( ptStart) ;
+      Point3d ptEnd ; m_CrvSmplS.back()->GetEndPoint( ptEnd) ;
+     // se distanza superiore al limite ridotto forzo i punti a coincidere
+      if ( ! AreSamePointEpsilon( ptStart, ptEnd, 0.01 * EPS_SMALL)) {
+         Point3d ptM = Media( ptStart, ptEnd) ;
+         m_CrvSmplS.front()->ModifyEnd( ptM) ;
+         m_CrvSmplS.back()->ModifyStart( ptM) ;
+      }   
+   }
+
    return ( m_nStatus == OK) ;
 }
 
diff --git a/PolyLine.cpp b/PolyLine.cpp
index d9fb83a..8a18072 100644
--- a/PolyLine.cpp
+++ b/PolyLine.cpp
@@ -645,6 +645,12 @@ PolyLine::GetAreaXY( double& dArea) const
    for ( bool bFound = GetFirstLine( ptIni, ptFin) ; bFound ; bFound = GetNextLine( ptIni, ptFin)) {
       dArea += ( ptIni.x - ptFin.x) * ( ptIni.y + ptFin.y) ;   // projection on xy
    }
+  // considero anche la linea tra l'ultimo e il primo punto perchè in alcuni casi potrebbero definire area 
+  // significativa anche se sono coincidenti per le nostre tolleranze
+   ptIni = ptFin ;
+   GetFirstPoint( ptFin) ;
+   if ( ! AreSamePointExact( ptIni, ptFin))
+      dArea += ( ptIni.x - ptFin.x) * ( ptIni.y + ptFin.y) ;
    dArea = 0.5 * dArea ;
    return true ;
 }