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Discusses the measurement of triangles. Covers similar triangles and corresponding angles, finding an unknown height in a similar triangle, and tangent ratios of varying angles (hypotenuse, adjacent, and opposite sides). Explains how to use a calculator to find the tangent ratio of any angle and how to use tangent ratios to find either an unknown adjacent or opposite side length.
Very good at explaining the reasonings and rationale for learning trigonometry!