The angle of depression is looking at an object below your line of sight.
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A sextant.
Angle of depression is defined as the angle between the horizontal line and the line joining the observer's line of sight to an object below the observer's eye sight. You can be on top of a building and an object is situated on the ground, and the angle between your horizontal line and the object is the angle of depression.
Your missing the angle of elevation or depression.
The alternate angle is 32 degrees and so 20/tan(32) = 32 meters
Using trigonometry and the tangent ratio its height is 135 meters to the nearest meter.