An angle
Yes when two lines share a common end point an angle is formed
Angle
an acute ray
An angle.
Angle
a rainbow 
An angle.
An angle is formed between the two rays at the common end point.
Angle
The vertex is the intersection of the rays that form an angle. The other ends go on indefinitely.
an angle
all it is, is two rays in the same line that end with the same endpoint