Question
An airplane is flying at an altitude of 15,000 ft. The angle of depression from the plane to an observation post (on the ground) is 21o. How far must the plane travel to be directly over the observation post?
Answers
Draw a diagram and it should be clear that the distance x can be found using
15000/x = tan21°
now finish it off
15000/x = tan21°
now finish it off
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