The angle of depression from D to F measures 40°.
If DE = 100 m, find DF. Round your answer to the nearest tenth.
cosine = adjacent over hypotenuse
cos(D) = DF / DE
cos(40o) = DF / 100 m
0.76604 = DF/ 100 m ==>> DF = 0.76604 • 100 m
DF = 76.604
DF = 76.6 rounded
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