AB is a tangent to the circle with centre O, touching it at A. If
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(i). Angle BAC = 90° - 50° = 40°.
(ii). Angle OCA = Angle OAC = 50°[ OA = OC - Angle opposite to equal sides]
(iii). Angle COA = 180° - [ 50° + 50°]
= 180° - 100° = 80°.
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