Question

Solve for C

Law of cosines really need help with this :)

Answer 1

`\textit{Law of Cosines}\\\\ c^2 = a^2+b^2-(2ab)\cos(C)\implies c = √(a^2+b^2-(2ab)\cos(C)) \\\\[-0.35em] ~\dotfill\\\\ c = √(19^2+26^2~-~2(19)(26)\cos(31^o)) \implies c = √( 1037 - 488072 \cos(31^o) ) \\\\\\ c \approx √( 1037 - (846.8813) ) \implies c \approx √( 190.1187 ) \implies c \approx 13.8`

Make sure your calculator is in Degree mode.