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[" If "vec a,vec b,vec c" and "vec d" ar...

[" If "vec a,vec b,vec c" and "vec d" are the position vectors of points "A,B,C" and "D" such that no three of "],[" them are collinear and "vec a+vec c=vec b+vec d," then "ABCD" is "],[[" (a) a parallelogram "," (b) a rhombus "],[" (c) a rectangle "," (d) a square "]]

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