Answer :

Given: and


In ΔOAB


Here,


OA = OB (radius)


Let OBA = OAB = x (angles opposite to equal sides are equal)


By angle sum property


AOB + OBA + OAB = 180°


50° + x + x = 180°


2x = 180° – 50°


2x = 130°


x = 60°


OAB = 60°

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