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Prove that the line of centres of two i...

Prove that the line of centres of two intersecting circles subtends equal angles at the two points of intersection

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IN `/_\OPO'` and `/_\OQO'`
`OP=OQ` (radii of same circle)
`O'P=O'Q` (radii of same circle)
`OO'=OO'` (common)
Thus, by side side side congruency,
`/_\OPO'` is congruent to `/_\OQO'`. Thus,
`/_OPO'=/_OQO'`
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