Question: In a city grid, $\|\overrightarrowOA\| = 5$ km and $\|\overrightarrowOB\| = 12$ km, with an angle of $90^\circ$ between them. If $\overrightarrowOC = 2\overrightarrowOA - \overrightarrowOB$, find $\|\overrightarrowOC\|$. - Nelissen Grade advocaten