Vertical angles at a transversal
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 141°. What is the measure of an angle that is its vertical (opposite) angle?
Answer: 141
Two parallel lines are cut by a transversal. One angle measures 38°. What is the measure of an angle that is its vertical (opposite) angle?
Answer: 38
Two parallel lines are cut by a transversal. One angle measures 136°. What is the measure of an angle that is its vertical (opposite) angle?
Answer: 136
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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