What is a defined as a set of points equidisant from a given point

A circle is the set of all points in a plane that are equidistant from a given point called the center of a circle. The line segment from the center of the circle to any point on the circle is the radius of the circle.

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Definition: A circle is the set of all points in a plane that are equidistant from a given point called the center of the circle. We use the symbol ⊙ to represent a circle. The a line segment from the center of the circle to any point on the circle is a radius of the circle.

The coordinates of point a right now is (-3,-1) you have to multiply these coordinates by a factor of 2 to get (-6,-2)