rainbow
an angle
a rainbow 
Yes. Any two rays which have the same end point.
An angle.
An angle!
all it is, is two rays in the same line that end with the same endpoint
an angle
Angle
Angle
a rainbow 
Yes. Any two rays which have the same end point.
angle
An angle.
An angle!
if the rays have no common points, the answer is zero. if the rays all have the same end point, the answer is 21 -- counting only the acute angles.
angle
A line