Answer:

1.∠1=∠4=∠8, equality

2.∠3+∠5=180°, angle of two complementary

3.∠3=∠6, equality

4.∠2=∠6, equality

5.∠1=∠5, ∠5+∠7=180°

∠1+∠7=180°, angle of two complementary

Step-by-step explanation:

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