yes it has one right angle
It can have at most one obtuse angle.
Yes
An arrowhead
A chevron or arrowhead.
The arrowhead has zero right angles.
Reflex angle
Yes
yes it has one right angle
It can have at most one obtuse angle.
It has one pair of opposite angles that are equal but not two.
Yes.
An arrowhead
Yes.
It can do but that is not a requirement.
A chevron or arrowhead.
It can do.It can do.It can do.It can do.