Adjacent sides of an arrowhead shape intersect at the vertex, so they are not parallel. Lines containing the segments making up opposite sides will always intersect, or it is not an arrowhead shape. They are not parallel, either. There are no parallel sides in an arrowhead shape. The picture may help.
Yes it does it has one set of parallel sides, n fact it is the same shape as an arrow head that you would use as a weapon
No hope this helped =)