Question

what is the description of (angle)4 as it relates to the situation below?
------4 is the angle of elevation from the person to the radar tower.
4 is the angle of depression from the radar tower to the person
4 is the angle of depression from the person to the radar tower
4 is the angle of elevation from the radar tower to the person

Answer 1

if you have a reference point P like this-

all the angles above the horizontal will be angle of elevation
angles below the horizontal will be angle of depression

here angle 1 is angle of elevation

angle 2 is angle of depression