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