[tex]b^2=a^2+c^2-2ac\text{ }cosB[/tex]
That"s the Cosine formula above
Given :
a=14
c=16
B=35 degree
Substitute into the formula
[tex]\begin{gathered} b^2=14^2+16^2-(2\times14\times16\times cos35) \\ b^2=452-366.98 \\ b^2=85.02 \\ b=\sqrt{85.02} \\ b=9.2 \end{gathered}[/tex]
