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The points \(A(20, 9)\), \(B(-15, -3)\), \(C(-15,-18)\) and \(D(20,-6)\) in order are the vertices of a Parallelogram. In the parallelogram the opposite sides are equal. Calculate the side values of the parallelogram using distance formula.
 
The sides of the parallelogram:
 
\(AB =\) i.
 
\(BC =\) i.
 
\(CD =\) i.
 
\(AD =\) i.