Answer :
you can use:
exterior angle theorem and angle sum theorem
OR,
the sum of linear pair is 180°
LOOK IN THE ATTACHED PICTURE TO UNDERSTAND BETTER!!!!
exterior angle theorem and angle sum theorem
OR,
the sum of linear pair is 180°
LOOK IN THE ATTACHED PICTURE TO UNDERSTAND BETTER!!!!
![View image rabinshrestha41](https://us-static.z-dn.net/files/da9/a80ae422f872d95fe1f2a4ebe11d8170.png)