Recall that two circles are congruent if they have the same radii. Prove that equal chords of congruent circles subtend equal angles at their centres.

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TextTheorem on Equal Chords and Equal Angles at CentreNCERT Textbook

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Prove that if chords of congruent circles subtend equal angles at their centres, then the chords are equal.

TextTheorem on Equal Chords and Equal Angles at Centre

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TextTheorem on Equal Chords and Equal Angles at Centre