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    (Original post by WildBerry)
    For i, I simply used the cosine rule for 2 of them and for the third I done 180-total. The 3 angles I got were 115.1 , 34.0 and 30.9 . So it's 115.1 which is right.
    As a tip for this, you don't actually need to work out all angles and determine the largest one from that. You just need to know that the largest angle is always opposite the longest side.
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    It doesn't matter what angle you use; your problem is probably arising because of rounding errors.
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