Circle:A circle is a shape consisting of all points in a plane that are at a given distance from a given point, the centre; equivalently it is the curve traced out by a point that moves in a plane so that its distance from a given point is constant
Radius:a straight line from the center to the circumference of a circle or sphere.
Diameter:a straight line passing from side to side through the center of a body or figure, especially a circle or sphere
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Answer:
Circle: A circle is a shape consisting of all points in a plane that are at a given distance from a given point, the centre; equivalently it is the curve traced out by a point that moves in a plane so that its distance from a given point is constant
Radius: a straight line from the center to the circumference of a circle or sphere.
Diameter: a straight line passing from side to side through the center of a body or figure, especially a circle or sphere