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Math Help - Law of Cosines

  1. #1
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    Law of Cosines

    I dont know how to find the side!

    Problem: a= 16 c= 12 B= 63degrees

    I know the formula to use afterwards.

    a^2=b^2 + c^2 - 2bc COS A
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  2. #2
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by topaz192 View Post
    I dont know how to find the side!

    Problem: a= 16 c= 12 B= 63degrees

    I know the formula to use afterwards.

    a^2=b^2 + c^2 - 2bc COS A
    you're supposed to use the formula to find the side.

    b^2 = (16)^2 + (12)^2 - 2(16)(12) \cos 63

    use that to find the other side, b
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  3. #3
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    Quote Originally Posted by topaz192 View Post
    I dont know how to find the side!

    Problem: a= 16 c= 12 B= 63degrees

    I know the formula to use afterwards.

    a^2=b^2 + c^2 - 2bc COS A
    Try this version of the formula:
    <br />
b^2=a^2+c^2-2ac\cos B
    It's the exact same thing with the letters rearranged.

    [EDIT]
    Dang he beat me, lol.
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  4. #4
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    lol yea i found a tutorial online thanks for your time though!
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