Friday, July 31, 2009

OK im very very bad at math so please help me?

In triangle ABC, angle A is 32 degrees, AB=8, BC=5. Find angle C. PLEASE HELP IM FAILING MATH. thank you

OK im very very bad at math so please help me?
58


or


122





lol
Reply:you need to use the sine formula


sin(A) / BC = sin(C) / AB


sin(32) / 5 = sin(C) / 8


etc for sin(C) then C
Reply:Using the Laws of Sines, you have


5/sin(32) = 8/sin(C)


sin(C)=(8sin(32))/5


C=57.98 = 58
Reply:it depends on which letter is on the 'hyp'.





The 'hyp' being the longest side.





You then can use trig to work it out.
Reply:you need to use the sine rule


a/sinA=b/sinB=c/sinA


small letters = length


CAPITOL LETTERS = ANGLES





so





5/sin32=8/sinC


8sin32/5=sin C


shift sin that answer


C=57.98083803


C=57.98(approximate to 2 decimal places)


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