Sum of central angles in a circle = 360 º 80º + 120º + x = 360º Simplify. 200º + x = 360º Subtract by 200 º on both sides. x = 160 º Hence, the measure of the missing central angle is 160 degrees. Example 4 What is the measure of ∠BOA

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Angle (Degrees) and Unit Circle. Conic Sections: Parabola and Focus