Grade 12 University: Algebraic vectors help

[Imming]

Hi everyone!
1. Homework Statement

α=90°
β=31°
$\gamma$=121°

2. Homework Equations
I need to determine the magnitude of one of the sides?



3. The Attempt at a Solution




I don't understand how to solve for the magnitude.

 

[Office_Shredder]

One of the sides of what? What are these angles of?

Note that there is a template suggested when you make a new thread which I'll repost here:

Homework Statement

Homework Equations

The Attempt at a Solution

This is suggested for a reason, following it allows us to help you far more efficiently