The center of a circle is the same for all circles but the length of the radius can change
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radius
An apothem is a line drawn perpendicular to a side of a regular polygon from the center of the polygon. A polygon is not a circle so it cannot have a radius. The radius of a circle is drawn from the center to any point in the circumference of the circle. You can draw a circle which encloses the regular polygon touching all vertices. The polygon is said to be inscribed in the circle. The apothem will be less than the radius because the radius is not perpendicular to any side, it can be drawn to a vertex but the apothem is perpendicular to a side, so it is shorter. Ex: draw a square with a circle which inscribes it. You can see that the apothem will be less than the radius.
The question is: Is A radius is an angle that connects to any point on the circle to the center of that circle? A Radius is a straight line coming from any point of the circle to the center of the circle. And remember that the Diameter is a straight line coming from any point of the circle and going straight through the center to the other side of the circle. The Radius is ALWAYS half of the Diameter; and, the Diameter is ALWAYS twice the Radius.
It is the circle's radius
The radius of a circle is the length of the line from the center of the circle to any point on its edge.