Alternate exterior angles and parallel lines
Parallel lines cut by a transversal make equal angles (corresponding, alternate, vertical) and angles that add to 180° (straight line, co-interior).
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Two parallel lines are cut by a transversal. One angle measures 31°. What is the measure of an angle that is its alternate exterior angle?
Answer: 31
Two parallel lines are cut by a transversal. One angle measures 49°. What is the measure of an angle that is its alternate exterior angle?
Answer: 49
Two parallel lines are cut by a transversal. One angle measures 83°. What is the measure of an angle that is its alternate exterior angle?
Answer: 83
Tip: Parallel lines cut by a transversal make equal angles (corresponding, alternate, vertical) and angles that add to 180° (straight line, co-interior).
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