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You need only know the radius of each circle to determine that they are congruent. If the radii are identical, the circles are identical. This can also be determined by comparing the diameters (twice the radii), or the circumferences, or the areas of the circles. In all cases, if the parameters are identical, the circles are identical.
Are congruent circles.
Congruent circles
All circles are similar, they all are the same shape, regardless of size. Only if they have equal diameters, would they be congruent.
They are congruent or identical circles