AB is a chord of the circle and AOC is is diameter such that angle ACB =55.If AT is the tangent to the circle at point A,then find angle BAT
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​https://www.meritnation.com/ask-answer/question/in-a-circle-ab-is-a-chord-and-aoc-is-its-diameter-such-that/circles/7105163
​https://www.meritnation.com/ask-answer/question/in-a-circle-ab-is-a-chord-and-aoc-is-its-diameter-such-that/circles/7105163