Respuesta :

gohyba

Answer:

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

siya90258

Answer:

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

123°+ <7=180°

<7=180°-123°

<7=57°