Given the vertices \(A (2, –2)\), \(B (7, 3)\), \(C (11, -1)\) and \(D (6, -6)\) in sequence, classify the quadrilateral formed by these points.
Midpoint of the diagonal is .
The length of the diagonal is
The length of \(AB\) \(AD\)
The quadrilateral \(ABCD\) forms ________