This week in Math 10 I learned what the angle of elevation and the angle of depression is on a triangle. These angles are usually in word problems and can be found the same way you would find any other angle. (By labelling your triangle, then using either Sine Cosine or Tangent to solve for x.)
The angle of elevation is found between the horizontal line and the slanted line that goes up (also called line of sight).
The angle of depression is found on the opposite side of the angle of elevation. It is the angle between the vertical line and the line of sight.
Here are some visuals:
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