Component method for vectors

1. The problem statement, all variables and given/known data
Use the componant method to determine the total displacement given by the two vectors shown in each diagram.

2. Relevant equations

3. The attempt at a solution

I thought I just had to find the third unknown side, and use the pythagorean theorem, but I was getting the wrong answer. My book says 11 km.

Any help is appreciated.

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