Respuesta :

Answer:

3.ABC is an isosceles triangle ,

x + x+ 42 = 180

2x + 42 = 180

2x = 180 - 42

2x = 138

x = 138/2

x = 69

4.

Sum of 2 interior angles = exterior angle

x + 58 = 102

x = 102 - 58

x = 44

Hope u understand

Step-by-step explanation: