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Yes. All radii of the same circle have the same length.
What the word congruent and circle have in common is that circles have a congruent radii. All of the radii in a single circle is congruent to each other.
Yes
Yes, providing that the radii are all in the same circle
Yes. That is obvious from the definition of a circle (or one possible definition): the set of all points in a plane that are at the same distance from a given point (the center of the circle).