Angles of elevation and depression

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Learn it The angle of elevation is measured up from the horizontal to an object; the angle of depression is measured down from the horizontal. Draw the right triangle, label what you know, and use the right trig ratio.

Example: From 40 m away, the angle of elevation to the top of a building is 52°. How tall is it?

tan 52° = h/40.
h = 40 tan 52° ≈ 51.2 m.

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