# Directed line segments

The above question got me thinking how to resolve this AFTER ofcourse substituting the values.. tks

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For example, by definition: $\vec{OA}+\vec{AB}=\vec{OB}$. So $\vec{OA}+\vec{AB}+\vec{BD}=\vec{OD}$. Add and solve. –  Bill Cook Sep 16 '12 at 23:38
Use $\vec{OD}=\vec{OA}+\vec{AB}+\vec{BD}$.