Answer:
Since\[{{\left( \text{12}
\right)}^{\text{2}}}+{{\left( \text{5} \right)}^{\text{2}}}={{\left( \text{13}
\right)}^{\text{2}}}\], so\[{{\text{A}}^{\text{2}}}+{{B}^{\text{2}}}={{\text{C}}^{\text{2}}}\].
It means the angle between \[\vec{A}\]and \[\vec{B}\]is\[\text{9}0{}^\circ \].
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