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[" 14."A(-2,7),B(7,15),C(-1,-5)" and "D(...

[" 14."A(-2,7),B(7,15),C(-1,-5)" and "D(h,k)" are the vertices "],[" of a parallelogram and "BC" is one of its diagonals.Find "(h,k)],[" and the angle between its diagonals."]

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