CAT Quantitative Ability Questions | CAT Geometry questions

CAT/2003

Question . 85

In the figure given below (not drawn to scale), A, B and C are three points on a circle with centre O. The chord BA is extended to a point T such that CT becomes a tangent to the circle at point C. If ∠ATC = 30° and ∠ACT = 50°, then the angle ∠BOA is

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Method of solving this CAT Quantitative Ability Question from Geometry question