Circles with the same radius are congruent circles.
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It's not a circle if it's radius of 5 degrees. If it's 5 cm radius, then 12 circles.
Yes, all circles are similer, they all have 1 line, all the same shape, any quarter of a circle will always be 25%, but it the line is bigger they still have differances and similarities, e.g a circle can have a radius of 25cm while another can have a radius of 93984389569349billion miles
Circles in the same plane with the same center are concentric circles.