Question 252102
Hint: use the <a href="http://en.wikipedia.org/wiki/Law_of_cosines">law of cosines</a> {{{a^2=b^2+c^2-2bc*cos(A)}}} where 'a', 'b', and 'c' are the lengths of the triangle and 'A' is the angle opposite the side 'a'. So this problem will make {{{a=38.9}}} and you'll let 'b' and 'c' be equal to the remaining values given. Let me know if this helps at all.