SAGAR SINGH - IIT DELHI
Last Activity: 14 Years ago
Dear student,
Its a very simple question. You just have to use cosine and sine formula.
If ABC is a triangle with sides a = BC, b = CA, c = AB, then prove that
In figure (i),
A < 90o
But from D BAE, we have
In figure (ii),
A > 90o
But from D BAE, we have
In figure(iii),
From (i), (ii) and (iii), we conclude that
Similarly, b2 = c2 + a2 - 2 ca cos B
Please feel free to ask your queries here. We are all IITians and here to help you in your IIT JEE preparation.
All the best.
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Sagar Singh
B.Tech, IIT Delhi
