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Name _______________________________________ Date __________________ Class __________________ LESSON 7-3 Line and Angle Relationships NOTES Lines in the same plane that never meet are called parallel lines. Two lines that intersect to form right angles are called perpendicular lines. Lines that do not intersect and are not parallel are called skew lines. Skew lines are in different planes. Use the figure to complete the statements. 1. AB and DC are ______________________ lines, since they never meet and lie in the same plane. 2. DH and EH are ____________________ lines, since they intersect to form right angles. 3. AB and EH are ____________________ lines, since they do not intersect and are not parallel. Adjacent angles have a common vertex and a common side, but no common interior points. Angles 2 and 3 in the diagram are adjacent. Adjacent angles formed by two intersecting lines are supplementary. Vertical angles are the opposite angles formed by two intersecting lines. Angles 1 and 3 in the diagram are vertical angles. Vertical angles have the same measure, so they are congruent. Name ________________________________________ Date___________________ Class _________________ A transversal is a line that intersects two or more lines. Transversals to parallel lines form special angle pairs. Opposite sides of transversal Opposite sides of transversal Same sides of transversal Inside the parallel lines Outside the parallel lines Same relative position Congruent angles Congruent angles Congruent angles Line n || line p. Find the measure of each angle. m1 = ______ m2 = ______ m3 = ______ m4 = ______ m5 = ______ m6 = ______ m7 = ______