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The points \(A(9, 8)\), \(B(12, 8)\), \(C(12,11)\) and \(D(9,11)\) in order are the vertices of a square. Find the value of distance and diagonals of the square.
 
Answer variants:
9
11
8
7
The distance between the points is 
and the diagonal is  this is equal to all the points which make the square shape.