Answer:
Angles 1, 3, 6, 8, 9, and 11 are exterior angles of triangle ABC.
Explanation:
Angles BAC, ABC, and ACB are interior angles of triangle ABC.
Angles 1, 3, 6, 8, 9, and 11 are exterior angles of triangle ABC.
Angles 2, 7 and 12 are neither interior nor exterior angles of triangle ABC.