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Math Help - Triangle Units

  1. #1
    Junior Member
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    Smile Triangle Units

    Hello,
    I hope you can help me solve this question.

    A triangle has sides of length 4, 5, 7 units. Find, to the nearest tenth of a degree, the size of the largest angle.

    Thanks.
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  2. #2
    MHF Contributor
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    Hi
    You can use the cosines formula
    a,b,c being the lengths of the sides of a triangle
    A,B,C being the angles (A is the angle formed with sides whose length are b anc c (opposite to the length a))
    a=b+c-2bc cosA
    Then cosA=(b+c-a)/(2bc)
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  3. #3
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    Thanks
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