Question

matching mathematical terms and definitions
match the definitions to the mathematical terms they describe.
piece of a line with one endpoint
line segment
two rays with a common endpoint
circle
all coplanar points equidistant from a given point
angle
piece of a line with two endpoints
ray

Explanation:

A ray is a piece of a line with one endpoint. An angle is formed by two rays with a common endpoint. A circle consists of all coplanar points equidistant from a given point. A line - segment is a piece of a line with two endpoints.

Answer:

piece of a line with one endpoint → ray
two rays with a common endpoint → angle
all coplanar points equidistant from a given point → circle
piece of a line with two endpoints → line segment