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Mathematics, 04.05.2020 23:28 tiffanyrenee3355

Quadrilateral Q O B C is inscribed within circle O. Sides A C and C B are congruent. Arc A B is 220 degrees. What is the measure of angle OAC if major arc AB measures 220 degrees?
55°
70°
110°
140°

The answer is 55, But can someone explained to me

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