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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