If u_(1) = ax + by + c, u_(2) = a'x + b'y + d, u_(3) = ax + by + c', u_(4) = a'x + b'y +d' then u_(1)= 0, u_(2) = 0, u_(3) = 0, u_(4) = 0 from a parallelogram. Then the diagonal.

If u_(1) = ax + by + c, u_(2) = a'x + b'y + d, u_(3) = ax + by + c', u

1.	If u_(1) = ax + by + c, u_(2) = a'x + b'y + d, u_(3) = ax + by + c', u_(4) = a'x + b'y +d' then u_(1)= 0, u_(2) = 0, u_(3) = 0, u_(4) = 0 from a parallelogram. Then the diagonal.
Answer» BD can be GIVEN by `u_(2)u_(3) - u_(1)u_(4) = 0` BD can be given by `u_(1)u_(2) = u_(3)u_(4) = 0` AC can be given by `u_(1)u_(2) - u_(3)u_(4) = 0` AC can be given by `u_(2)u_(3) = u_(1)u_(4) = 0` ANSWER :A

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If u_(1) = ax + by + c, u_(2) = a'x + b'y + d, u_(3) = ax + by + c', u_(4) = a'x + b'y +d' then u_(1)= 0, u_(2) = 0, u_(3) = 0, u_(4) = 0 from a parallelogram. Then the diagonal.

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