Having a trouble visualizing this physics problem (vectors)

[grim grove]

Initially I thought of doing the pythagorean theorem to solve for vector B and then doing inverse Tangent of B/A to get the angle

[buoyant lake]

you cant use pythagorean theorem because its not a right triangle

you could draw the vectors A and C as coming out of the origin

and the B would be the vector from the tip of A to the tip of C

and you can use law of cosines to find the magnitude of B

[grim grove]

Thanks i figured it out!

.solved