PointHard
Question
Four points (x1, y1), (x2, y2), (x3, y3) and (x4, y4) are such that 
(x1x3 + x2x4 + y1y2 + y3y4)
Then these points are vertices of -
(x1x3 + x2x4 + y1y2 + y3y4)Then these points are vertices of -
Options
A.Parallelogram
B.Rectangle
C.Square
D.Rhombus
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