A plane is 6000 feet above the ground when it begins its final approach
to an airport runway. If the ground distance to therunway is 20 miles, what
is the angle of descent? (1 mile = 5280 feet) Round to the nearest degree.
Hint: To avoid decimals do 20 x 5280 to convert the horizontal from miles
to feet. Then, you are ready to do the trigonometry.