Answer:
∠1 and ∠5 = congruent
∠1 and ∠6 = supplementary
∠1 and ∠7 = supplementary
∠1 and ∠8 = congruent
∠10 and ∠14 = congruent
∠12 and ∠13 = congruent
∠9 and ∠15 = supplementary
∠11 and ∠16 = supplementary
Hope this helps! :)
