Prove ∠4 ≌ ∠12
Prove ∠9 ≌ ∠16
Prove ∠5 ≌ ∠8
Prove ∠11 ≌ ∠14
Prove ∠7 ≌ ∠15
Prove ∠3 ≌ ∠10
Prove ∠10 ≌ ∠11
Prove ∠8 ≌ ∠13