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Q: 2 Prove that if chords of congruent circles subtend equal angles at their centres, then the chords are equal.

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Given : chords of congruent circles subtend equal angles at their centres,

To prove: $BC = QR$

Proof:

In $\triangle X Y Z$ and $\triangle P Q R$,
$\angle \mathrm{YXZ}=\angle \mathrm{QPR}$ (Given)
$X Y=P Q$ (Radii of congruent circle)
$\mathrm{XZ}=\mathrm{PR} \quad$ (Radii of congruent circle)
Thus, $\triangle X Y Z \cong \triangle P Q R($ By SAS rule)
$\mathrm{YZ}=\mathrm{QR}$  (CPCT)

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