Island a is 210 miles from island b. a ship captain travels 230 miles from island a and then finds that he is off course and 180 miles from island b. what bearing should he turn to, so he is heading straight towards island b?

Let the point where the ship turns be C.

A, B and C form a triangle whose have length 230, 210 and 180 miles.

According to the cosine Law:













Thus, m(ACB)=60°,

thus x=120°

x=120°

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