Question 1178171
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            702  degrees for the angle looks too much  ().


            Check and fix it  (!)


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After fixing,  use the cosine law.



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.


In addition to the theory, &nbsp;clearly explained, &nbsp;you will find there many solved problems, &nbsp;that are your &nbsp;TEMPLATES.



Consider these lessons as your handbook, &nbsp;textbook, &nbsp;guidelines, &nbsp;tutorials and &nbsp;(free of charge) &nbsp;home teacher.



Happy learning &nbsp;(!)