Answer:
3, 6, 7, 10, 11
Step-by-step explanation:
The angles congruent to angle 1 are the corresponding angles and their vertical angles.
The corresponding angles are the ones on the north-east corner of the intersection: 1, 7, 11
The angles that are vertical angles with those are ...
3, 6, 10
So, the angles congruent to angle 1 are 3, 6, 7, 10, 11.
