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Lines AB and FC are parallel. Line BC is a transversal.

1. Use points A, B, and C to move the lines. Observe the angle values.
2. <ABC and <HCB are alternate interior anlges. Name another pair of alternate interior angles.
3. Compare different pairs of alternate interior angles. What do you notice?

 

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Shape & Space : Alternate Angles

Barbara Perez, Created with GeoGebra