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GeoGebraGeoGebra Classroom

Parallel Lines and Corresponding Angles

Blue parallel lines cut across by a red transversal. The angle pair shown below are called corresponding angles. What do you notice about their position? Their angle measures? Drag points B and C to a variety of positions and note how angles p and t relate to each other. Use the check boxes to make other pairs of corresponding angles active and see how moving B and C affect these new angle pairs. What can you conclude about corresponding angles?