angles of elevation and depression

Question 1

what is the angle of elevation?

Answer 1

when you look up at an aircraft in the sky, the angle through which your line of light turns from looking straight ahead (horizontal) is called the ANGLE OF ELEVATION

Question 2

what is the angle of depression?

Answer 2

when you are standing on a high point and look down at a boat, the angle through which your line of light turns from looking straight ahead (the horizontal) is called the ANGLE OF DEPRESSION