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Trigonometry, Cosine Rule, IB Math HL

PostPosted: Wed Jan 29, 2014 7:20 am
by Oliver
IB Mathematics HL – Trigonometry, Cosine Rule

How can we solve the triangle using Cosine Rule given that , and .


Thanks

Re: Trigonometry, Cosine Rule, IB Math HL

PostPosted: Wed Jan 29, 2014 7:20 am
by miranda
IB Math HL – Trigonometry, Cosine Rule

Applying the Cosine Rule we have that









Now, in order to find another angle, for example , we could apply again cosine rule and solve for as following















Finally, for the angle we have that




Hope these help!! :) :)

Re: Trigonometry, Cosine Rule, IB Math HL

PostPosted: Wed Jan 29, 2014 7:21 am
by Oliver
Thank you miranda!!