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Parallel lines cut by a transversal. I moved the numbers 1 and 2 around and we had to name the angle pairs. It was set up in 2 rounds. Round 1: Name < pair. Round 2: solve for missing angles (I had <1=50 for ex) on the board and they found <2. Round 3: same as Round 1 I just used algebra examples.

Math Giraffe

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