C4 AQA January 2012 Q2

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Hi, how do you decide that the final side must be 4 in the first triangle you draw?

Thanks

hamzaabuelmagd
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What would you do if the cos alpha was obtuse plz help my core 4 exam in a week :(

aleryani
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where does the 12 and the 9 go near the end?

ITFCBlue
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You don't explain anything you do!

laurathelionfish
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How fricken thick are you guys? His explanations are perfectly fine. Damn tho, that actually helped. THANKS A BUNCH!!

anonymouslogger