Watch these videos as revision or to clarify further the key concepts in this topic
This video goes through a sample problem on angle of elevation.
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Here is a very good video which clearly goes through all the fundamental concepts of trigonometry and SOHCAHTOA in right angled triangles
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This video gives a problem using angles of depression and elevation. You should pause the video and attempt to do the calculations yourself before watching the teacher solve the problem.
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Here is another video with a practice problem on angles of depression which you should use for revision by pausing and solving the problem before you watch the teacher solve it.
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