Question

which defines a line segment?
two rays with a common endpoint
a piece of a line with two endpoints
a piece of a line with one endpoint
all points equidistant from a given point

Explanation:

A line segment is a part of a line. It has two distinct endpoints.

• "Two rays with a common endpoint" defines an angle.
• "A piece of a line with one endpoint" defines a ray.
• "All points equidistant from a given point" defines a circle.

Answer:

a piece of a line with two endpoints