Answer
$\vec{AB}=\vec{DC}$
$\vec{DA}=\vec{CB}$
$\vec{DE}=\vec{EB}$
$\vec{CE}=\vec{EA}$
Work Step by Step
To match vectors, look for pairs of the same direction and magnitude.
Pairs $\vec{AB}=\vec{DC}$ and $\vec{DA}=\vec{CB}$ are easy to spot by their unique direction and magnitudes.
For inner pairs,$\vec{DE}=\vec{EB}$ and $\vec{CE}=\vec{EA}$. Vectors can only be equal when BOTH direction and magnitude are equal.
$\vec{DE}$ and $\vec{EB}$ both point northeast and share the same magnitude. $\vec{CE}$ and $\vec{EA}$ both point northwest and share the same magnitude. These are your pairs.
