Question

Find the measure of 21. Justify your answer.
75°
2
1
m

Answer 1

Lines l and m are parallel. That makes angle 1 and the angle, which measures 75°, corresponding angles. Corresponding angles are congruent. Therefore angle 1 measures 75°.

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Corresponding angles are angles that are on the same side of the transversal and they are also in the same position (but in different line).

Answer 2

2 would be 105 and 1 is 75