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let the points be A,B,C,D.
distance between points under root (x2-x1) whole square+(y2-y1)whole square
so distance of AB=under root 20
distance of BC=       " "           80
"          "       CD=     "  "           20
"         "         DA=    "  "           80 
THAT MEANS THAT opp sides are equal  then diagonals must also be equal then
AC=10 and BD=10 as diagonals and opp sides are equal they are vertices of rectangle
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For this jst show two opposite sides and diagonals equal and in the end write  that its proved that it is a rectangle.............................that's it.
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