Lesson 21 Name. Study the example showing how to use angle pair- relationships to find measures of angles. Then solve problems 1-5. Example 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. 41 and 49 are corresponding angles. Corresponding angles formed by a transversal- crossing parallel lines are congruent, so 41 = 29. 24 and 25 are alternate interior angles. Alternate interior angles between parallel lines are congruent, so 24 == 45. 41 and /3 form a linear pair. Linear pairs are supplementary, som/1 1 m/3 = 180", Use the diagram in the example. Name a different pair of corresponding angles, a different pair of alternate interior angles, and a different linear pair. Vocabulary transversal a line corresponding angles: crosses two lines. alternate interior angles: corresponding angles angles in the linear pair. same position in the 21 Use the diagram in the example. If.m/7 = 108, what is intersections of a m/12? Explain how you found the measure. transversal and two or more parallel lines. alternate interior angles angles between two parallel lines and on opposite sides of a transversal linear pair adjacent supplementary angles