Two line segments with common end points form an ________ .
Line:
The line connects the two distinct points, and it can be extended from the points or .
Line segment:
A line with two distinct points under the constraint condition is called a segment.
Here, is the line segment.
Angle:
Two lines with common end points form an angle.
Construct two line segments and .
Therefore, the two line segments and with the common point , forms an angle .
Hence, two line segments with common end points form an angle.