Verified answer

Answer:

I.

1. These are vertical angles
2. These are supplementary angles

II.

1. Always true
2. Sometimes true
3. Always true
4. Never true
5. Always true
6. Always true
7. Never true
8. Always true
9. Always true
10. Always true

III.

A.

1. m∠b=150°
2. m∠d=60°
3. m∠d=120°

B.

1. m∠a=20°
2. m∠b=160°
3. m∠a=110°

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