Scuba divers use a red flag with a white diagonal stripe to let other people know the scuba divers are under water. which angles must be congruent in order for the top and bottom edges of the flag to be parallel?

For a short time after a wave is created by wind , the height of the wave can be modeled using y= a sin 2pi(t) / t where a is the amplitude and t is the period of the wave in seconds. how many times over the first 5 seconds does the graph predict the wave to be 2 feet high?