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Angle of Depression

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AngleofDepression

The angle of depression is the angle from a horizontal line downward to a line of sight. In the figure, O is the observer, P is the observed point, and alpha is the angle of depression. If the horizontal lines through the observer and the observed point are parallel, the angle of depression equals the corresponding angle of elevation by the alternate interior angle theorem.

See also

Angle, Angle of Elevation

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References

Gellert, W.; Gottwald, S.; Hellwich, M.; Kästner, H.; and Künstner, H. (Eds.). VNR Concise Encyclopedia of Mathematics, 2nd ed. New York: Van Nostrand Reinhold, 1989.

Cite this as:

Weisstein, Eric W. "Angle of Depression." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/AngleofDepression.html

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