# Math Help - Parallelogram vectors

1. ## Parallelogram vectors

ABCD - parallelogram:

vector AB + vector DC = ?
So I would want to do this:

And say that vector AB + vector DC = vector AC, but I'm pretty sure that's wrong.

2. $\overrightarrow {AB} + \overrightarrow {DC} = 2\overrightarrow {AB}$
3. Thank you! But could it also be $\overrightarrow {AB} + \overrightarrow {DC} = 2\overrightarrow {DC}$?
$\overrightarrow {AB} = \overrightarrow {DC}$