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what must be true about angle 6 and angle 3 for the lines to be parallel? Name the postulate or therom

what must be true about angle 6 and angle 3 for the lines to be parallel Name the postulate or therom class=

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duskowl45
It should be supplementary angles theorem. 6 and 3 must add to 180 degrees to make a straight line.
MuskanAfzal
angle 6 and angle 3 are co-interior angles
theorem:If two parallel lines are cut by a transversal, then the pairs of consecutive interior angles formed are supplementary.