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OpenStudy (anonymous):
An airplane flies 200km due west from city A to city B and then 300km in the direction of 30.0 degrees north of west from city B to city C. In straight-line distance, how far is city C from city A?
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OpenStudy (jt950):
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OpenStudy (jt950):
Apply cos rule , CA^2 = 200^2 + 300^2 - 2 (200)(300)cos120 CA=435.89km
OpenStudy (anonymous):
how do you know that angle is 120???
OpenStudy (anonymous):
oh never mind. thank you!
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