I would imagine you can do so. You might find a quicker proof using the Law of Cosines, though.Originally Posted by ling_c_0202
I"ve got a question. it is not difficult for us to accept that 'in a triangle, a longer side correspond a greater opposite angle'. however, how can we prove that? Is it possible for me to use sine formula to prove?
It is rather basic. Difficult to explain without a diagram. What you do is construct a triangle with equal angles (thus equal sides) on the side of the triangle. Then you use the fact "The whole is greater than the sum of its parts).Originally Posted by ling_c_0202