Find the type of quadrilateral formed by the points \(A (2, –2)\), \(B (7,  3)\), \(C (11, -1)\) and \(D (6, -6)\) taken in order.
 
Midpoint of the diagonal is ii,ii.
 
The length of the diagonal is i
 
The length of \(AB\) \(AD\)
 
The quadrilateral \(ABCD\) forms ________