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Given: The two circles are congruent if they have the same radii.
To prove: The equal chords of congruent circles subtend equal angles at their centres i.e.
BAC=
QPR
Proof :
In
ABC and 
PQR,
BC = QR (Given)
AB = PQ (Radii of congruent circle)
AC = PR (Radii of congruent circle)
Thus,
ABC 
PQR (By SSS rule)