To create a Quadrangle in the Main Menu select Model -> Construction -> Add Quadrangle.
There are two algorithms to create a Quadrangle.
The Quadrangle can be defined by its vertices Vertex 1, Vertex 2, Vertex 3 and Vertex 4.
Arguments: 4 vertices.
The dialogue box for to create a quadrangle from vertices is:
Add Quadrangle from vertices
The Quadrangle can also be defined by its edges Edge 1, Edge 2, Edge 3 and Edge 4.
Arguments: 4 edges.
The dialogue box to create a quadrangle from edges is:
Add Quadrangle from edges
TUI command: Quadrangles