Show that the points (2,4) ,(2,-1) , (-3,-1) and (3,4) are the vertices of a square

Show that the points (2,4) ,(2,-1) , (-3,-1) and (3,4) are the vertice

1.	Show that the points (2,4) ,(2,-1) , (-3,-1) and (3,4) are the vertices of a square
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