17. An airport control tower measures the distance to one plane that has just taken off to be 500 m and the distance to a second plane coming in for landing to be 1050 m. If the angle between the lines of observation on the radar screen is 86, how far apart are the two planes? Solve using cosine law and round your answer to the nearest metre. 18. Jackie is shooting pucks on an empty net during hockey practice. She is standing to one side of the net. The goal post closest to her is 23 ft away and the goal post furthest from her is 26 ft away. If the goal posts are 6 ft apart, how many degrees shooting variance does Jackie have that will result in her getting a goal? Solve using cosine law and round your answer to one decimal place