Posted by Sha on Saturday, March 14, 2009 at 10:54am.
Yes. I have no idea what the question is.
Whether the law of cosines or the law of sones be used first to solve for the triangle
If you are given three sides, start with the law of cosines to get one angle. Then you may go to the law of sines to get the second angle, then the third angle is solved by knowing the sum of the interior angles of a triangle is 180deg.
I got this answer wrong but don't understand where I made the mistake.
a=16, b=13, c=10
a^2=b^2+c^2-2bc Cos A
16^2=13^2+10^2-2(13)(10) Cos A
16^2-13^2-10^2/-2(13)(10)=-2(13)(10)/-2(13)(10)
-13/-260 Cos A = 0.05=Cos A = 152=A
sinB/b=SinA/a
Sin B/13=Sin152/16
Sin B = 13 Sin 152/16
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