What is the definition of a circle?
1. A circle is the set of all points in a plane that are a given distance from a given line.
2.A circle is the distance from a set of points to a fixed point called the center.
3. A circle is a set of all points that are the same distance form a fixed point called the center
4.A circle is the set of all points in a plane that are the same distance from a fixed point called the center.