Show that dioganals (successive vertices of a quadrilateral are A(2,3),B(-1,4),C(-8,11), and D(3,9))

Oguzzzhan

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the successive vertices of a quadrilateral are A(2,3),B(-1,4),C(-8,11) AND D(3,9). showthat the diagonals of the quadrilateral are perpendicular
 
An alternative approach: what is the dot product of perpendicular vectors?
 
the successive vertices of a quadrilateral are A(2,3),B(-1,4),C(-8,11) AND D(3,9). show that the diagonals of the quadrilateral are perpendicular
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