tim_72
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Hi

I have no idea what I've done wrong doing this question. The mark scheme has a slightly different answer to mine (112°), but it uses a different method (line AC + cosine rule) so I can't really pinpoint my mistake. See below for question and working

Thanks
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tim_72
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tim_72
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It does say that cda=90°
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tim_72
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(Original post by tim_72)
It does say that cda=90°

Oh wait I see what you mean now. Thanks
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Muttley79
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(Original post by tim_72)
Oh wait I see what you mean now. Thanks
Yes, you've assumed BAD is also 90 ...try drawing another diagram and find AC first.
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