Posted by **Sha** on Saturday, March 14, 2009 at 10:54am.

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**, Saturday, March 14, 2009 at 11:00am
Yes. I have no idea what the question is.

- Alge2/trig -
**Sha**, Saturday, March 14, 2009 at 11:01am
Whether the law of cosines or the law of sones be used first to solve for the triangle

- Alge2/trig -
**bobpursley**, Saturday, March 14, 2009 at 11:07am
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**, Saturday, March 14, 2009 at 11:32am
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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