Question

two circle are congruent if and only if they have equal radii
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Answer 1

Answer:

I hope it's help you.

Step-by-step explanation:

Two circles are said to be congruent if and only if their radii are equal. Let AB & CD are two equal chords of two congruent circles with Centre O and O'. i.e AB= CD. Hence, equal chords of congruent circles subtend equal angles at their centres.

Answer 2

yes the two circle are congruent if and only they have equal radii