Posted by Sha on .
Should the triangle be solved beginning with Laws of Sines or Laws of Cosines. Then solve the triangle and round to the nearest tenth. a=16, b=13, c=10

Alge2/trig 
bobpursley,
Yes. I have no idea what the question is.

Alge2/trig 
Sha,
Whether the law of cosines or the law of sones be used first to solve for the triangle

Alge2/trig 
bobpursley,
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.

Alge2/trig 
Sha,
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^22bc Cos A
16^2=13^2+10^22(13)(10) Cos A
16^213^210^2/2(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