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+.. _length_2d_page:
+
+*********
+Length 2D
+*********
+
+This quality control criterion consists of calculation of length of the links between corner nodes of mesh faces.
+
+**To apply the Length 2D quality criterion to your mesh:**
+
+#. Display your mesh in the viewer. 
+#. Choose **Controls > Face Controls > Length 2D** or click **"Length 2D"** button in the toolbar. 
+
+.. image:: ../images/image34.png
+	:align: center
+
+.. centered::
+	**"Length 2D" button**
+
+Your mesh will be displayed in the viewer with links colored according to the applied mesh quality control criterion:
+
+.. image:: ../images/length2d.png
+	:align: center
+
+
+**See Also** a sample TUI Script of a :ref:`tui_length_2d` operation.  
+
+