There are only two angle measures here, an angle, a bunch of congruent copies, and its supplement, with a bunch of congruent copies.
∠1 ≅ ∠3 ≅ ∠5 ≅ ∠7 are all supplementary to ∠2 ≅ ∠4 ≅ ∠6 ≅ ∠8
