[m]|\vec{a}|=\sqrt{4^2+(-2)^2+3^2}=\sqrt{29}[/m] [m] \vec{b}=(0; 4; \sqrt{13})[/m] [m]|\vec{b}|=\sqrt{0^2+4^2+\sqrt{13}^2}=\sqrt{29}[/m]