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A : The area of the parallelogram formed...

A : The area of the parallelogram formed by `4x-7y-13=0, 8x-y-39=0, 4x-7y+39=0, 8x-y+13=0` is 52.
R : The area of the parallelogram formed by `a_(1)x+b_(1)y+c_(1)=0, a_(1)x+b_(1)y+d_(1)=0, a_(2)x+b_(2)y+c_(2)=0, a_(2)x+b_(2)y+d_(2)=0` is `|((c_(1)-d_(1))(c_(2)-d_(2)))/(a_(1)b_(2)-a_(2)b_(1))|`

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