diff --git a/EgtGeomKernel.rc b/EgtGeomKernel.rc
index 6716bf9..006e971 100644
Binary files a/EgtGeomKernel.rc and b/EgtGeomKernel.rc differ
diff --git a/Polygon3d.cpp b/Polygon3d.cpp
index 473348e..b41e773 100644
--- a/Polygon3d.cpp
+++ b/Polygon3d.cpp
@@ -13,6 +13,7 @@
 
 //--------------------------- Include ----------------------------------------
 #include "stdafx.h"
+#include "PolygonPlane.h"
 #include "/EgtDev/Include/EgkPolygon3d.h"
 
 using namespace std ;
@@ -209,6 +210,29 @@ Polygon3d::GetPolyLine( void) const
    return PL ;
 }
 
+//----------------------------------------------------------------------------
+double
+Polygon3d::GetPerimeter( void) const
+{
+   double dLen = 0 ;
+   for ( size_t i = 0 ; i < m_vVert.size() ; ++ i) {
+      size_t j = ( i + 1 < m_vVert.size() ? i + 1 : 0) ;
+      dLen += Dist( m_vVert[i], m_vVert[j]) ;
+   }
+   return dLen ;
+}
+
+//----------------------------------------------------------------------------
+double
+Polygon3d::GetArea( void) const
+{
+   double dArea = 0 ;
+   PolygonPlane PolyPlane ;
+   for ( const auto& ptP : m_vVert)
+      PolyPlane.AddPoint( ptP) ;
+   return ( PolyPlane.GetArea( dArea) ? dArea : 0) ;
+}
+
 //----------------------------------------------------------------------------
 void
 Polygon3d::Translate( const Vector3d& vtMove)