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trig

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City A is 300km due east of city B. City C is 200km on a bearing of 123¤ from city B. How far is it from C to A?

  • trig -

    171km

  • trig -

    123-90 = 33 south of east
    law of cosines
    b^2 = a^2 + c^2 - 2 a c cos B
    b^2 = 200^2 + 300^2 - 2(200*300) cos 33

  • trig -

    yes I get 171.346

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