An observer (o) spots a plane flying at a 35° angle to his horizontal line of sight. if the plane is flying at an altitude of 17,000 ft., what is the distance (x) from the plane (p) to the observer (o)?

The angle of elevation of the plane p = 35° is the same of the observer with the horizontal (corresponding angles), so to calculate x, which is the hypotenuse of the right triangle we will apply:

sinb35° = 17000/x or x = 17000/sin35°, sin35° =0.573576

x= 17000/0.53576 = 23,639 ft

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