triangulation_boundary_nodes_test, a C++ code which calls triangulation_boundary_nodes(), which analyzes the triangulation of a region, and lists those nodes which lie on the boundary of the triangulation.
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triangulation_boundary_nodes, a C++ code which reads data defining a triangulation, determines which nodes lie on the boundary, and writes their coordinates to a file.
ELBOW is a curved region, looking like an elbow, that lies inside the unit square. It is triangulated using order 3 triangles. There are 320 nodes and 568 triangles. There are 66 nodes on the boundary.
LAKE is an irregular lake-shaped region with an "island". It is triangulated using order 3 triangles.