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Answer:
Definition of circle
Explanation:
All the points that lies on the circle must be same distance from the center.
This is given by the definition of a circle.
Radius is the length from the center to the points lying on the circle.
Distance formula: [tex]d =\sqrt{(x_2 - x_1)^2 + (y_2 - y_1)^2}[/tex]
Diameter of circle is from one end point to another end point lying on circle.