Answer:
angle 1: angle of depression
angle 2: angle of elevation
angle 4: angle of elevation
Step-by-step explanation:
It's a matter of definition (and some amount of "common sense").
An angle of <em>elevation</em> is measured from the horizontal to a point <em>above</em> the horizontal.
An angle of <em>depression</em> is measured from the horizontal to a point <em>below</em> the horizontal.
Not surprisingly, the meanings of the words <em>elevation</em> and <em>depression</em> in this context are not terribly different from their usual English meanings.
