Remember alternative exterior angles are congruent... that means for example 12 that the angles are congruent
Also, interior angles are congruent... that means for example 17 the angles are congruent (also 19)
And, vertical angles are also congruent... that means for example in 18 the angles are congruent...
Consecutive angles also are congruent... that means 14
Corresponding angles are also congruent.. that means for example 13
Any other ones that I didn't exactly list... if they look like the ones I DID list then they go under that definition...
Hope this helps :)