Martha drew a pair of intersecting non-perpendicular lines, l and m. She numbered one pair of vertical angles ∠1 and ∠2 , and she labeled the second pair of vertical angles ∠3 and ∠4. Martha made the conjecture that ∠1≅∠2. To validate this conjecture, which of the following would be appropriate reasoning?.

Which of the following is an example of an opposing signal? no examplthates given.   i would say, that traffic lights in a city at major intersections direct the flow of traffic in opposite directions so would be an example.also, stop signs on either side of the same street would be an example. at a train crossing, the light for allowing car traffic in opposite directions or not would be another example.