[b]Angle of elevation[/b] is the angle between the line of sight and the horizontal line when a person sees an object which is at a _______________ level.
[b]Angle of depression[/b] is the angle between the line of sight and the horizontal line when a person sees an object which is at a _______________ level.
When a person [b]sees an object which is at a higher level[/b], the angle between the line of sight and the horizontal line.
When a person [b]sees an object which is at a lower level[/b], the angle between the line of sight and the horizontal line.