Question 1157453
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Apply the cosine law.


c = {{{sqrt(a^2 + b^2 - 2ab*cos(gamma))}}} = {{{sqrt(150^2 + 98^2 - 2*150*98*cos(85^o))}}}.


You do the calculations.
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On the "cosine law", see the lessons

&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF=http://www.algebra.com/algebra/homework/Trigonometry-basics/Proof-of-the-Law-of-Cosines-revisited.lesson>Proof of the Law of Cosines revisited</A>

&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF=http://www.algebra.com/algebra/homework/Trigonometry-basics/Solve-triangles-using-Law-of-Cosines.lesson>Solve triangles using Law of Cosines</A>

in this site.