How Do You Define Vector OA in These Images?

[An1MuS]

OA vector in both images (sorry for the size, couldn't put it smaller)

http://www.mathhelpforum.com/math-help/attachments/f14/19600d1289073955-defining-vector-xywh4.jpg

http://www.mathhelpforum.com/math-help/attachments/f14/19601d1289073989-defining-vector-fs5q1.jpg

 

[Studiot]

Nice pictures, but what's the question?

 

[An1MuS]

My problem is defining vector OA in both situations. :)