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OpenStudy (anonymous):
Suppose that ABCD is a parallelogram, and
A=(-1,2), B=<2,b> C=(5,-1), D=
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OpenStudy (amoodarya):
hint : A+C=B+D it means (XA,YA)+(XC,YC)=(XB,YB)+(XD,YD) put the values in relation soon you will find the answer
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