This is a free lesson from our course in Trigonometry

 This lesson introduces the basic concepts of the trigonometric functions and explains how you can solve word problems that involve angle of elevation and depression. You'll learn it with the help of some examples, practice questions with solution and using video explanation in own handwriting by the instructor. The angle of elevation is the angle between the horizontal and the line from the object to the observer's eye (the line of sight). (More text below video...)
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 Real-World Applications Indirect Measuring with triangles
(Continued from above) On the other hand; if the object is below the level of the observer, an angle of depression is the angle between the horizontal and the observer's line of sight.These types of angles, along with concepts from trigonometry can be used to indirectly calculate heights of objects or distances between points. Alternatively, if the heights or distances are known, the angles can be determined as well. You'll learn here the steps or method to find angle of elevation or angle of depression when the distance is known. Alternatively the method to find out the distance or length, given the angle of elevation or depression is presented. For example, in case the top of a vertical cliff 40 m high, the angle of depression of an object that is level with the base of the cliff is 34, the object from the base of the cliff will be 59.30 m.
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