prove that in two congruent circles, equal chords subtend equal angles at their respective centres .
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Step-by-step explanation:
Given: Two circles with centre O and O' have equal radii. AB is the chord of the circle with centre O and A'B' is a chord of the circle with centre O'. AB = A'B' (Given). Hence, equal chords of two congruent circles subtend equal angles at their respective centres.
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