If A(-2,1),B(a,0),C(4,b) and D(1,2) are the vertices of a parallelogram ABCD, find the values of a and b. Hence find the lengths of its sides.
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If A(-2,1),B(a,0),C(4,b) and D(1,2) are the vertices of a parallelogram ABCD, find the values of a
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