On circle of center O, angle ABO = angle BOC = 2 * angle BOA. Then angle CBO measures ?
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Two-dimensional figure measured in terms of radius. It is formed by a set of points that are at a constant or fixed distance from a fixed point in the center of the plane. The parts of the circle are circumference, radius, diameter, chord, tangent, secant, arc of a circle, and segment in a circle.
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