# Cut sector

Geometry Level 2

$$\Gamma$$ is a circle with center $$O$$. $$AOB$$ is a circular sector of $$\Gamma$$ with $$\angle AOB = 50^\circ$$. $$C$$ is a point on minor arc $$AB$$ such that $$\angle AOC = 20 ^\circ$$. What is the measure (in degrees) of $$\angle ACB$$?

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