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Math Help - please help with this question

  1. #1
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    Red face please help with this question

    Two airplanes leave an airport at the same time, and the angle between their flight paths is 40*.An hour later, one plane has traveled 300 miles, while the other has travelled 200 miles,each in a straight line. How far apart are the planes at this time?
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  2. #2
    Grand Panjandrum
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    Quote Originally Posted by cinbad
    Two airplanes leave an airport at the same time, and the angle between their flight paths is 40*.An hour later, one plane has traveled 300 miles, while the other has travelled 200 miles,each in a straight line. How far apart are the planes at this time?
    This is an allication of the cosine rule. You have a triangle with two
    sides one 300 and the other 200 miles, and the angle between them
    is 40 degrees.

    <br />
c^2=a^2+b^2-2ab \cos (\theta)<br />

    Substitute a=200, b=300 and \theta=40^{\circ} into the above and that's it

    RonL
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  3. #3
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    Thank you very much Captain
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