diff --git a/EXE_GdbGetCurve.cpp b/EXE_GdbGetCurve.cpp
index d8f8894..19ede39 100644
--- a/EXE_GdbGetCurve.cpp
+++ b/EXE_GdbGetCurve.cpp
@@ -21,6 +21,7 @@
 #include "/EgtDev/Include/EXeConst.h"
 #include "/EgtDev/Include/EGkCurve.h"
 #include "/EgtDev/Include/EGkCurveArc.h"
+#include "/EgtDev/Include/EGkCurveBezier.h"
 #include "/EgtDev/Include/EGkCurveComposite.h"
 #include "/EgtDev/Include/EGkDistPointCurve.h"
 #include "/EgtDev/Include/EGkIntersCurves.h"
@@ -127,6 +128,50 @@ ExeCurveIsFlat( int nId, Plane3d& Plane, bool bUseExtrusion, double dToler)
    return ( pCurve != nullptr  &&  pCurve->IsFlat( Plane, bUseExtrusion, dToler)) ;
 }
 
+//----------------------------------------------------------------------------
+bool
+ExeCurveIsACircle( int nId, Point3d& ptCen, Vector3d& vtN, double& dRad, bool& bCCW, double dToler)
+{
+   IGeomDB* pGeomDB = GetCurrGeomDB() ;
+   VERIFY_GEOMDB( pGeomDB, false)
+  // verifico i parametri
+   if ( &ptCen == nullptr  ||  &vtN == nullptr  ||  &dRad == nullptr  ||  &bCCW == nullptr)
+      return false ;
+  // recupero l'oggetto
+   IGeoObj* pGObj = pGeomDB->GetGeoObj( nId) ;
+   if ( pGObj == nullptr)
+      return false ;
+  // analizzo tipi di curve candidabili
+   switch ( pGObj->GetType()) {
+   case CRV_ARC :
+      {  ICurveArc* pArc = GetCurveArc( pGObj) ;
+         if ( pArc->IsACircle()) {
+            ptCen = pArc->GetCenter() ;
+            vtN = pArc->GetNormVersor() ;
+            dRad = pArc->GetRadius() ;
+            bCCW = ( pArc->GetAngCenter() > 0) ;
+            return true ;
+         }
+      }
+   case CRV_COMPO :
+      { ICurveComposite* pCompo = GetCurveComposite( pGObj) ;
+        return pCompo->IsACircle( dToler, ptCen, vtN, dRad, bCCW) ;
+      }
+   case CRV_BEZIER :
+      { ICurveBezier* pBezier = GetCurveBezier( pGObj) ;
+        PolyArc PA ;
+        if ( ! pBezier->ApproxWithArcs( dToler, ANG_TOL_STD_DEG, PA))
+           return false ;
+        PtrOwner<ICurveComposite> pCompo( CreateCurveComposite()) ;
+        if ( IsNull( pCompo)  ||  ! pCompo->FromPolyArc( PA))
+           return false ;
+        return pCompo->IsACircle( dToler, ptCen, vtN, dRad, bCCW) ;
+      }
+   }
+
+   return false ;
+}
+
 //----------------------------------------------------------------------------
 bool
 ExeCurveAreaXY( int nId, double& dArea)
diff --git a/EgtExecutor.rc b/EgtExecutor.rc
index 8080921..9e204f5 100644
Binary files a/EgtExecutor.rc and b/EgtExecutor.rc differ
diff --git a/LUA_GdbGetCurve.cpp b/LUA_GdbGetCurve.cpp
index fbdf590..09b5aa4 100644
--- a/LUA_GdbGetCurve.cpp
+++ b/LUA_GdbGetCurve.cpp
@@ -90,6 +90,30 @@ LuaCurveIsFlat( lua_State* L)
    return 3 ;
 }
 
+//----------------------------------------------------------------------------
+static int
+LuaCurveIsACircle( lua_State* L)
+{
+  // 1 o 2 parametri : Id [, dToler]
+   int nId ;
+   LuaCheckParam( L, 1, nId)
+   double dToler = EPS_SMALL ;
+   LuaGetParam( L, 2, dToler) ;
+   LuaClearStack( L) ;
+  // verifico se curva è equivalente ad una circonferenza
+   Point3d ptCen ;
+   Vector3d vtN ;
+   double dRad ;
+   bool bCCW ;
+   bool bCircle = ExeCurveIsACircle( nId, ptCen, vtN, dRad, bCCW, dToler) ;
+   LuaSetParam( L, bCircle) ;
+   LuaSetParam( L, ptCen) ;
+   LuaSetParam( L, vtN) ;
+   LuaSetParam( L, dRad) ;
+   LuaSetParam( L, bCCW) ;
+   return 5 ;
+}
+
 //----------------------------------------------------------------------------
 static int
 LuaCurveAreaXY( lua_State* L)
@@ -369,6 +393,7 @@ LuaInstallGdbGetCurve( LuaMgr& luaMgr)
    bOk = bOk && luaMgr.RegisterFunction( "EgtCurveLength", LuaCurveLength) ;
    bOk = bOk && luaMgr.RegisterFunction( "EgtCurveIsClosed", LuaCurveIsClosed) ;
    bOk = bOk && luaMgr.RegisterFunction( "EgtCurveIsFlat", LuaCurveIsFlat) ;
+   bOk = bOk && luaMgr.RegisterFunction( "EgtCurveIsACircle", LuaCurveIsACircle) ;
    bOk = bOk && luaMgr.RegisterFunction( "EgtCurveAreaXY", LuaCurveAreaXY) ;
    bOk = bOk && luaMgr.RegisterFunction( "EgtCurveArea", LuaCurveArea) ;
    bOk = bOk && luaMgr.RegisterFunction( "EgtCurveExtrusion", LuaCurveExtrusion) ;