diff --git a/EXE_GdbModifyCurve.cpp b/EXE_GdbModifyCurve.cpp
index 5f97919..df151c7 100644
--- a/EXE_GdbModifyCurve.cpp
+++ b/EXE_GdbModifyCurve.cpp
@@ -1666,6 +1666,20 @@ ExeModifyArcRadius( int nId, double dRad, bool bKeepCenter)
    return bOk ;
 }
 
+//-------------------------------------------------------------------------------
+bool
+ExeModifyArcAngCenter( int nId, double dAngCenter)
+{
+   IGeomDB* pGeomDB = GetCurrGeomDB() ;
+   VERIFY_GEOMDB( pGeomDB, false)
+  // recupero l'arco
+   ICurveArc* pArc = GetCurveArc( pGeomDB->GetGeoObj( nId)) ;
+   if ( pArc == nullptr) 
+      return false ;
+  // modifico angolo al centro
+   return pArc->ChangeAngCenter( dAngCenter) ;
+}
+
 //-------------------------------------------------------------------------------
 bool
 ExeModifyArcC2P( int nId, const Point3d& ptEnd, int nRefType)
diff --git a/EgtExecutor.rc b/EgtExecutor.rc
index 31ad564..7d79767 100644
Binary files a/EgtExecutor.rc and b/EgtExecutor.rc differ
diff --git a/LUA_GdbModifyCurve.cpp b/LUA_GdbModifyCurve.cpp
index fc903c8..88b8d55 100644
--- a/LUA_GdbModifyCurve.cpp
+++ b/LUA_GdbModifyCurve.cpp
@@ -586,6 +586,22 @@ LuaModifyArcRadius( lua_State* L)
    return 1 ;
 }
 
+//-------------------------------------------------------------------------------
+static int
+LuaModifyArcAngCenter( lua_State* L)
+{
+  // 2 parametri : Id, dNewAngCenter
+   int nId ;
+   LuaCheckParam( L, 1, nId)
+   double dNewAngCenter ;
+   LuaCheckParam( L, 2, dNewAngCenter)
+   LuaClearStack( L) ;
+  // modifica dell'angolo al centro
+   bool bOk = ExeModifyArcAngCenter( nId, dNewAngCenter) ;
+   LuaSetParam( L, bOk) ;
+   return 1 ;
+}
+
 //-------------------------------------------------------------------------------
 static int
 LuaModifyArcToExplementary( lua_State* L)
@@ -1214,6 +1230,7 @@ LuaInstallGdbModifyCurve( LuaMgr& luaMgr)
    bOk = bOk && luaMgr.RegisterFunction( "EgtSplitCurveAtCorners", LuaSplitCurveAtCorners) ;
    bOk = bOk && luaMgr.RegisterFunction( "EgtSplitCurveAtSelfInters", LuaSplitCurveAtSelfInters) ;
    bOk = bOk && luaMgr.RegisterFunction( "EgtModifyArcRadius", LuaModifyArcRadius) ;
+   bOk = bOk && luaMgr.RegisterFunction( "EgtModifyArcAngCenter", LuaModifyArcAngCenter) ;
    bOk = bOk && luaMgr.RegisterFunction( "EgtModifyArcToExplementary", LuaModifyArcToExplementary) ;
    bOk = bOk && luaMgr.RegisterFunction( "EgtModifyArcByFlip", LuaModifyArcByFlip) ;
    bOk = bOk && luaMgr.RegisterFunction( "EgtCloseCurveCompo", LuaCloseCurveCompo) ;