Question

a plane flying at 33,000 feet is 13o miles away from the airport when it begins to descent.find the angleof depression of the plane to the starting point of the airport

Answer 1

Draw the diagram. It should be clear that if the 130 miles is along the ground, then
tanθ = (33000/5280) / 130

Otherwise, if the 130 miles is line-of-sight,
sinθ = (33000/5280) / 130