The points \(A(-12, -9)\), \(B(9, 3)\), \(C(9,18)\) and \(D(-12,6)\) in order are the vertices of a parallelogram. In the parallelogram, the opposite sides are equal. Calculate the side values of the parallelogram using the distance formula.
The sides of the parallelogram:
\(AB =\) .
\(BC =\) .
\(CD =\) .
\(AD =\) .