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 Central angle:  Central angles are angles in which the vertex of the angle is the center of a circle.

Angles in a Circle: Investigate how the location of an angle's vertex affects its relationship to the measure(s) of the arc(s) it intercepts.

Area of a Sector: Determine a relationship between the area of a circle's sector and the radius and central angle of the circle, and between the arc length of a sector and the radius and central angle of the circle.