Question

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

Explanation:

A circle is defined as the set of all points in a plane (coplanar) that are at a fixed distance (equidistant) from a given point (the center).

• Option A defines an angle (two rays with a common endpoint).
• Option B defines a line - segment (a piece of a line with two endpoints).
• Option C defines a ray (a piece of a line with one endpoint).
• Option D correctly defines a circle.

Answer:

D. all coplanar points equidistant from a given point