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If a transversal intersects two parallel lines, then

sum of interior angles on the same side of a transversal is __________.

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If the sum of measures of two angles is 180°, then they are _________.

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A transversal intersects two or more than two lines at _________points.

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If a transversal intersects two parallel lines, then

alternate interior angles have one common __________.

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If a transversal intersects two parallel lines, then

corresponding angles are on the ________ side of the transversal.