Given: points be A (a, b), B(a’, b’),C(-a, b) and D(a’, -b’)
P and Q be the mid points of AB and CD, respectively.
The equation of the line passing through P and Q is
⇒ 2ay - 2b’x = ab – a’b’
Hence, the equation of the required straight line is 2ay - 2b’x = ab – a’b’
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