plz ans this question...
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Step-by-step explanation:
Join OA and OB
→OA =OB (radii of the same circle )
→<OAB =<OBA =50
→<AOB =80
Since ,angle subtended by an Arc at the centre is double the angle subtended by it at Any other point on the circle
→<ACB =<AOB /2= 40
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