Question

how to do this ??????pleass help​

Answer 1

Step-by-step explanation:

Join O,A

then <OAB =<OBA=30 ° (OA and OB are radii)

similarly <OAC = OCA= 40°

Thus<BAC = 30+40 = 70°

Now <BAC is front angle thus 2<BAC =<BOC

Thus < BOC = 140°

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