Question
If $a = 3$, $b = 4$, and $c = 5$, each one of $\vec{a}$, $\vec{b}$, and $\vec{c}$ is perpendicular to the sum of the remaining vectors. Then, $|\vec{a} + \vec{b} + \vec{c}|$ is equal to
If $a = 3$, $b = 4$, and $c = 5$, each one of $\vec{a}$, $\vec{b}$, and $\vec{c}$ is perpendicular to the sum of the remaining vectors. Then, $|\vec{a} + \vec{b} + \vec{c}|$ is equal to