Why is angle 1 congruent with angle C in the diagram
A. They interior angles to the triangle
B. They are corresponding angles
C. They are exterior angels to the triangle
D. They are vertical angles
Please help me with this answer
![Why is angle 1 congruent with angle C in the diagram A They interior angles to the triangle B They are corresponding angles C They are exterior angels to the tr class=](https://us-static.z-dn.net/files/d9c/36494dd787861cf69110319457376744.png)