[color=#45818e][b]Bektore baten modulua: [math]\vec{u}·\vec{u}=\mid\vec{u\mid}^2;\ \mid\vec{u\mid}=\sqrt{\vec{u}·\vec{u}}[/math][br][br]Bi bektoreren arteko [math]\alpha[/math] angelua: [math]cos\alpha=\frac{\vec{u}·\vec{v}}{\vec{\mid u}\mid·\mid\vec{v}\mid}[/math][/b][/color]