AB isa given line draw C D and EF parallel to AB on either side of AB.check if CD and Ef are parallel to each other
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Make a transversal which intersects the line CD AND EF then mark those points as A and B.
If Angle ABF = Angle BAC. So it is proved that CD II EF because angle 1 = angle 2 by alternative angle property.
If Angle ABF = Angle BAC. So it is proved that CD II EF because angle 1 = angle 2 by alternative angle property.
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