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Angles of Depression and Elevation

September13

Angles of Depression and Angles of Elevation both relate to the view from a horizontal line. When someone is depressed they tend to look down and the same is true for an angle of depression – it is an angle looking down from an imaginary horizontal line. In the sketch below, imagine someone in the hot air balloon, looking down at the tree. Their view forms an Angle of Depression. If someone was sitting at the base of the tree, looking up to the balloon, then their view is called an Angle of Elevation. Both angles are the same in this example, as they are alternate angles between the two horizontal (and hence parallel) horizon lines.
angles of depression and elevation2

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