I am new to this forum and I really could use some help if any one has the answer please let me know how you got it

The magnitudes FA=40 N and FB=50 N FC=40 N

the angles alpha=50 deg and beta = 80 degrees

Determine the magnitude of FA+FB+FC

The book has the answer as 83 N and I have not clue on how they got this answer.

Can anyone help