Posted by Ariel on Saturday, November 15, 2008 at 2:15pm.
I guess what you might mean is due to the fact that sin (180 - A) = sin A when A is between 0 and 90 degrees
so for example sin 150 = sin 30 = .5
Now when we go to use law of sines
sin A/a = sin B/b
say A = 30 and sin A = .5
then
.5/a = sin B/b
but you would get a very different triangle with the same sin A = .5 if A were 150 degrees.
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