Angle DCB is the angle of elevation, and angle ADC is the angle of depression.
The angle of elevation
From the figure, we have;
Lines AB and CD to be parallel lines.
The angle that points up from one of the parallel lines through the slant line BC is the angle of elevation.
From the figure, angle DCB points up from line CD
Hence , ∠DCB is the angle of elevation.
Angle of depression
The angle that points down from one of the parallel lines through the slant line BC is the angle of depression.
From the figure, angle ADC points down from line AB
Hence , ∠ADC is the angle of depression.
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