Find C vector, with two known magnitudes

[Casodd]

Homework Statement

https://i.imgur.com/UtLzb34.png

Homework Equations

the law of cosinus

The Attempt at a Solution

I have not been available to scan my work, but I'm kinda stuck at the beginning. And our teacher have not show us this kind of physics yet.
Thanks.

 

[lekh2003]

Welcome to PF, what method have you already tried? I'm assuming you are using the tail-to-tip method since the law of cosines relevant. What exactly are you having trouble with?

Edit: I would appreciate even just a photo of your work (make sure its neat and legible).

 

[Casodd]

So all I have to do is take the square root of ( |A|^2+ |B|^2cos79 ) ?
and then do tan delta to find the degree? (Which is not the question) ?
picture:

Thanks for answering.

 

[lekh2003]

So all I have to do is take the square root of ( |A|^2+ |B|^2cos79 ) ?
and then do tan delta to find the degree? (Which is not the question) ?
picture:
View attachment 218369

Thanks for answering.

Yes, this looks accurate. That's how I did it. Good job!