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Solution :

As we know that, mid point of AC= mid point of BD <br>
`((-2-4)/2, (-1+B)/2) = ((a+1)/2, (0+2)/2)` <br>
`(2/2, (b-1)/2)= ((a+1)/2, 1)` <br>
`a+1/2= 1 & (b-1)/2 = 1` <br>
`a+1=2` <br>
`a=1` <br>
`(b-1)/2 = 1` <br>
`b-1=2` <br>
`b=3` <br>
points are`B(9,0), B(1,0)` <br>
`C(4,1)` <br>
`C(4,3)` <br>
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