AC is tangent, AOC is 75 degrees. What is the angle ACO

By the property of the tangent AC, drawn to the circle, the radius OA drawn to this tangent will be perpendicular to this tangent. Then the angle CAO = 90.

The sum of the inner angles of the triangle is 180, then the angle ACO = 180 – CAO – AOC = 180 – 90 – 75 = 15.

Answer: The ACO angle is 15.

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