Relax

Respuesta :

Jsf09

Step-by-step explanation:

the 3rd angle = 4x+17 because of vertical angles

4x+17 + x+23 + 80 = 180 sum of interior angles of a triangle

5x +40 = 100

5x = 60

x = 12

angle A = x + 23 = 12 +23 = 35