Question

WARNING: EPIC QUETION!
What are the coordinates of the fourth vertex of parallelogram ABCD?

https://docs.google.com/file/d/0B8kl9mSQsJu9d0F5ekRUS1N6ZGc/edit?usp=sharing

Answer 1

https://docs.google.com/file/d/0B8kl9mSQsJu9d0F5ekRUS1N6ZGc/edit?usp=sharing

Answer 2

please help :'(

Answer 3

Since : ABCD is a parallelogram then :
\[\overrightarrow{AB}=\overrightarrow{DC}\]
So if D(x,y) then :
\[\begin{pmatrix}-6-(-5)\\4-0\end{pmatrix}=\begin{pmatrix}2-x\\4-y\end{pmatrix}\]
So :
\[x=2+6-5=3\\y=4-4=0\]
Then :
\[D(3,0)\]

Answer 4

THANK YOU ^.^