The angle that is not congruent to angle 5 is angle 6
The angles that are congruent to angles 5 are corresponding to angle 5, the vertical angles of angle 5 and the opposite exterior angles of angle 5.
These angles are:
Angle 1, angle 8, and angle 4
Other angles are not congruent to angle 5
Hence, the angle that is not congruent to angle 5 is angle 6
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