////a//.\

////a/\.\\b

a//./____\

.........c

a = 12, b = 19, and A (opposite a) = 82 deg's

remember that

now you can easily solve for B.

Once you have B you know that A+B+C = 180 so you can get C and finally use C and the law of sines to get c

let me know if you need more help