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6 September, 23:38

The angle of depression from D to F measures 40°. If DE = 100 m, find DF. Round your answer to the nearest tenth.

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  1. 7 September, 02:45
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    You need to draw the triangle DEF with a right angle at E. Angle D = 40 and DE = 100 m. Once you have marked up your triangle, you can use cosine to find DF.
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