An airplane is flying a constant altitude of 100m above the ground. At that instant, it was recorded that the angle of depression of the airport is 40 degree. Find the horizontal distance between the airplane and the airport.

Elementary Geometry for College Students
6th Edition
ISBN:9781285195698
Author:Daniel C. Alexander, Geralyn M. Koeberlein
Publisher:Daniel C. Alexander, Geralyn M. Koeberlein
Chapter11: Introduction To Trigonometry
Section11.CT: Test
Problem 12CT
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An airplane is flying a constant altitude of 100m above the ground. At that instant, it was recorded that the angle of depression of the airport is 40 degree. Find the horizontal distance between the airplane and the airport.
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