homework and exercises - Direction of angular velocity

please help me here! Im confused, is direction of angular velocity perpendicular to the plane of motion, or along the plane of motion??

From hyperphysics - http://hyperphysics.phy-astr.gsu.edu/hbase/rotq.html

And wikipedia https://www.dropbox.com/s/13g86di3prid46h/Screenshot_2015-11-22-09-37-03-1.png?dl=0

Please also provide explanation if possible!