In the diagram, lines w. x, and y are parallel. use the
terms corresponding angles, alternate interior angles,
and linear pair to describe some of the angle
relationships in the diagram.
21 and 29 are corresponding angles.
corresponding angles formed by a transversal
crossing parallel lines are congruent, so 21 19.
24 and 25 are alternate interior angles. alternate interior
angles between parallel lines are congruent, so 24 = 25.
21 and 23 form a linear pair. linear pairs are supplementary,
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