A quarterback and receiver are playing catch. While the quarterback is 9 feet away from the receiver, the receiver is sitting on top of a ladder 5 feet up. In order for the quarterback to throw the ball perfectly at the receiver, he uses the trig function tan^-1 (5/9) in order to find the angle of elevation of 29.1° to perfect his throw.
Another receiver steps up and this time he is sitting 7 feet up on top of a ladder. The quarterback's angle to the receiver is 33°. In order to figure how far the quarterback is from the receiver, the quarterback uses the trig function 7/tan(33). He then figures out that he is about 10.8 yards away from the receiver.
Next in line is another receiver. He sets up another ladder and is sitting 13 feet from the quarterback. The quarterback's angle of elevation is 35°. He wonders how high the receiver is sitting, so he uses the trig function 13/cos(35). He then comes to the conclusion that the receiver is sitting 15.9 feet high.
Now that the last receiver is up to catch, the quarterback wants to know how far he should throw the ball. The receiver is 6 feet high and the quarterback wants to throw at an angle of 28°. In order to find the distance, the quarterback uses the trig function of 6/sin(28). He concludes that he should throw to a distance of about 12.8 feet.
Since the quarterback and all of the receivers put in work, they can happily go home and rest for the night.