--- /dev/null
+.. _uniting_two_triangles_page:
+
+*********************
+Uniting two triangles
+*********************
+
+In MESH you can union two neighboring triangles by deletion of the common edge.
+
+*To unite two triangles:*
+
+.. |img| image:: ../images/image71.png
+
+#. From the **Modification** menu choose the **Union of two triangles** item or click *"Union of two triangles"* button |img| in the tool-bar.
+
+ The following dialog box shall appear:
+
+ .. image:: ../images/unionoftwotriangles.png
+ :align: center
+
+
+#. Enter IDs of nodes forming the required edge in the **Edge** field (a couple of node IDs separated by a dash) or select this edge in the 3D viewer.
+#. Click the **Apply** or **Apply and Close** button.
+
+.. image:: ../images/uniting_two_triangles1.png
+ :align: center
+
+.. centered::
+ "The selected triangles"
+
+
+.. image:: ../images/uniting_two_triangles2.png
+ :align: center
+
+.. centered::
+ "The union of two triangles"
+
+**See Also** a sample TUI Script of a
+:ref:`tui_uniting_two_triangles` operation.
+
+
