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The points \(A(8, 1)\), \(B(20,1)\), \(C(8,-6)\) and \(D(20,-6)\) in order are the vertices of a Rectangle. In the rectangle, the opposite sides are equal. Calculate the side values of the rectangle using distance formula.
 
The sides of the Rectangle are:
 
\(AB =\) i.
 
\(BC =\) i.
 
\(CD =\) i.
 
\(AD =\) i.