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Theorem If two parallel lines are cut by a transversal, the same side interior angles are supplementary. Theorem If a transversal is perpendicular to one of two parallel lines, it is perpendicular to the other line also. Summarizing, we have: If two parallel lines are cut by a transversal, then the corresponding∠’s are congruent.

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Two straight lines in a plane are called parallel if they do not intersect even at extended length. The next statement is a postulate , that is a statement, which is accepted without proof: For a given straight line and a point in the plane outside of this straight line there is one and only Lochinvar tech support.