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Prove that if chords of congruent circl...

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

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In `/_\AOB` and `/_\COD`,
`OA = OC` and `OB = OD` (Radii of circle)
`/_AOB = /_DOC`
So, by Side Angle Side congruency,
...
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