Yes. Any two rays which have the same end point.
An angle.
an angle
An angle
a rainbow 
Together, they form an angle.
Yes. Any two rays which have the same end point.
Yes, numerous rays can have the same point.
An angle.
Two rays starting at the same point of origin form an angle
No. Two rays can be parallel and so would never form an angle. Also, an angle (a single one as opposed to a quartet of angles) is formed by two coterminus line segments. That is to say, the line segments stop where they meet. A ray goes on forever in both directions.
An angle is formed when two rays begin at a common point. The common point is called the vertex of the angle.
an angle
angle
Angle
Angle
Concurrent