Wednesday
July 1, 2015

Homework Help: Algebra II/ Trig

Posted by Sha on Saturday, March 14, 2009 at 11:48am.

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

I got this answer but it is wrong and 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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