Two parallel lines are cut by a transversal what is the measure of 7

57

Step-by-step explanation:

since angle 3 is 57 (180-123=57) and 3 and 7 are corresponding, and corresponding angles are congruent,angle 7=57

angle 1 and angle 7=180°[co exterior angle]

123°+ <7=180°

<7=180°-123°

<7=57°

i can't see the picture : /