Final answer:
A circle is defined as the set of all points that are the same distance from a given point called the center.
Step-by-step explanation:
A circle is defined as the set of all points that are the same distance from a given point called the center.
To visualize this, imagine a dot in the center of a piece of paper. Now draw a curve that touches the dot at every point and is equidistant from the center. That curve is a circle, and all the points on it are the same distance from the center.
Therefore, option OA is the correct answer choice as it accurately defines a circle.
Learn more about Definition of a circle