13. Find the side and diagonals of the square

The points $A(3, 10)$, $B(9, 10)$, $C(9,16)$ and $D(3,16)$ in order are the vertices of a square. Find the value of distance and diagonals of the square.

 

The distance between the points is  and the diagonal is √72√75√71√70 this is equal to all the points which make the square shape.