2.  I can prove and use theorems about the angles formed by parallel lines and a transversal.

3. angle 1 ≅ angle 3 angle 2 ≅ angle 4 Angle 5 ≅ angle 7 angle 6 ≅ angle 8

4. Let’s Do It!

6. Label all the angle measures.

7. Let’s Do It AGAIN! Find all the angle measures.

8. Complete the two-column proof of the Alternate Exterior Angels Theorem. Given: l ll m Prove: angle 1 ≅ angle 2 StatementsReasons 1. l ll m Given 2. ____________Vertical angle Theorem 3. Angle 3 ≅ angle 2 ______________ 4. ___________________________ 1 2 3 l m