trig
posted by tim on .
A plane is flying at an elevation of 30000 feet.
It is within sight of the airport and the pilot finds that the angle of depression to the airport is 18.
Find the distance between the plane and the airport.
Find the distance between a point on the ground directly below the plane and the airport.

Isn't 30,000/slantdistance=sin18?

huh?

b=a(tanB)
where a is your altitude, B is your angle of depression and b is your distance to airport.
b=30,000(tan(72))
b=92,330.51